‖n. pl. [ NL.; Gr. &unr_;, &unr_;, a ray + &unr_; a ring. ] (Zool.) A peculiar larval form of Phoronis, a genus of marine worms, having a circle of ciliated tentacles. [ 1913 Webster ]

adj. 1. stimulating or acting on the adrenal cortex [ WordNet 1.5 ]

n. 1. a growth hormone produced by the anterior pituitary gland; it stimulates the adrenal cortex.
Syn. -- adrenocorticotropic hormone, adrenocorticotrophic hormone, adrenocorticotrophin, corticotropin, corticotrophin, ACTH [ WordNet 1.5 ]

a. [ Gr. &unr_; changeful + &unr_; a turning, &unr_; to turn. ] (Physics) Exhibiting differences of quality or property in different directions; having properties with different values along different axes; not isotropic. In specialized contexts, synonymous with anisotropic. [ Also spelled eolotropic. ] Sir W. Thomson.
Syn. -- [ 1913 Webster ]

n. (Physics) Difference of quality or property in different directions. [ 1913 Webster ]

n. a genus of snakes comprising the copperheads.
Syn. -- genus Agkistrodon, Ancistrodon, genus Ancistrodon. [ WordNet 1.5 ]

n. [ Corrupt. fr. Pg. alcatraz cormorant, albatross, or Sp. alcatraz a pelican: cf. Pg. alcatruz, Sp. arcaduz, a bucket, fr. Ar. al-qādus the bucket, fr. Gr. ka`dos, a water vessel. So an Arabic term for pelican is water-carrier, as a bird carrying water in its pouch. ] (Zool.) A web-footed bird, of the genus Diomedea, of which there are several species. They are the largest of sea birds, capable of long-continued flight, and are often seen at great distances from the land. They are found chiefly in the southern hemisphere. [ 1913 Webster ]

a. [ Gr. 'a`llos other + trophic. ] (a) (Physiol.) Changed or modified in nutritive power by the process of digestion. (b) (Plant Physiol.) Dependent upon other organisms for nutrition; heterotrophic; -- said of plants unable to perform photosynthesis, as all saprophytes; -- opposed to autotrophic. [ Webster 1913 Suppl. ]

{ } a. [ Cf. F. allotropique. ] Of or pertaining to allotropism. -- Al`lo*trop"ic*al*ly, adv. [1913 Webster]

Allotropic state, the several conditions which occur in a case of allotropism. [1913 Webster]

n. Allotropic property or nature. [ 1913 Webster ]

v. t. To change in physical properties but not in substance. [ R. ] [ 1913 Webster ]

{ } n. [ Gr. &unr_; other + direction, way, &unr_; to turn: cf. F. allotropie. ] (Chem.) The property of existing in two or more conditions which are distinct in their physical or chemical relations. [ 1913 Webster ]

☞ Thus, carbon occurs crystallized in octahedrons and other related forms, in a state of extreme hardness, in the diamond; it occurs in hexagonal forms, and of little hardness, in black lead; and again occurs in a third form, with entire softness, in lampblack and charcoal. In some cases, one of these is peculiarly an active state, and the other a passive one. Thus, ozone is an active state of oxygen, and is distinct from ordinary oxygen, which is the element in its passive state. [ 1913 Webster ]

n. 1. any of various South American plants of the genus Alstroemeria valued for their handsome umbels of beautiful flowers. [ WordNet 1.5 ]

n. 1. 1 one of many families or subfamilies into which some classification systems subdivide the Liliaceae but not widely accepted; sometimes included in subfamily Amaryllidaceae.
Syn. -- family Alstroemeriaceae. [ WordNet 1.5 ]

a. 1. Having the faculty of using both hands with equal ease. Sir T. Browne. [ 1913 Webster ]

2. Practicing or siding with both parties. [ 1913 Webster ]

All false, shuffling, and ambidextrous dealings. L'Estrange. [ 1913 Webster ]

adv. In an ambidextrous manner; cunningly. [ 1913 Webster ]

n. The quality of being ambidextrous; ambidexterity. [ 1913 Webster ]

‖n. [ Gr. 'a`metros irregular + 'w`ps, 'wpo`s, eye. ] (Med.) A visual impairment resulting from faulty refraction of light rays in the eye. Subtypes include myopia astigmatism and hyperopia. -- Am`e*trop"ic a. AS [1913 Webster +PJC]

adj. Of or pertaining to ametropia. [ WordNet 1.5 ]

‖n. [ NL., fr. Gr. 'amfi` + trocho`s a wheel. ] (Zool.) A kind of annelid larva having both a dorsal and a ventral circle of special cilia. [ 1913 Webster ]

{ } a. [ Gr. 'amfi` + tre`pein to turn. ] (Bot.) Having the ovule inverted, but with the attachment near the middle of one side; half anatropous. [ 1913 Webster ]

‖n. [ Gr. &unr_;, fr. &unr_; to turn up or back; 'ana` + &unr_; to turn. ] (Rhet. & Gram.) An inversion of the natural order of words; as, echoed the hills, for, the hills echoed. [ 1913 Webster ]

‖n. [ F. anatron, natron, Sp. anatron, natron, fr. Ar. al-natrūn. See Natron, Niter. ] [ Obs. ] 1. Native carbonate of soda; natron. [ 1913 Webster ]

2. Glass gall or sandiver. [ 1913 Webster ]

3. Saltpeter. Coxe. Johnson. [ 1913 Webster ]

{ } a. [ Gr. &unr_; up + &unr_; to turn. ] (Bot.) Having the ovule inverted at an early period in its development, so that the chalaza is as the apparent apex; -- opposed to orthotropous. Gray. [ 1913 Webster ]

a. [ Gr. &unr_;; &unr_; a hook + &unr_; shape. ] Hook-shaped. [ 1913 Webster ]

n. [ Gr. &unr_; up + E. electrode. ] (Elec.) The positive pole of a voltaic battery. [ 1913 Webster ]

‖n. [ NL., fr. Gr. &unr_; up + E. electrotonus. ] (Physiol.) The condition of decreased irritability of a nerve in the region of the positive electrode or anode on the passage of a current of electricity through it. Foster. [ 1913 Webster ]

n. [ Anemometer + -graph. ] An anemograph. Knight. [ 1913 Webster ]

adj. 1. of or pertaining to anestrus. [ WordNet 1.5 ]

2. not in a state of estrus; not in heat; -- of lower mammals; as, an anestrous bitch. Opposite of estrous. [ WordNet 1.5 ]

‖n. [ NL., fr. Gr. &unr_; + &unr_; measure + &unr_;, &unr_;, eye. ] Unequal refractive power in the two eyes. [ Webster 1913 Suppl. ]

{ } a. [ Gr. &unr_; unequal + &unr_; a turning, &unr_; to turn. ] (Physics) Not isotropic; having different properties in different directions; thus, crystals of the isometric system are optically isotropic, but all other crystals are anisotropic. [ 1913 Webster ]

a. Anisotropic. [ 1913 Webster ]

n. The antiparticle of a neutron. It has the same mass as a neutron, but a spin and magnetic moment opposite that of the neutron. [ WordNet 1.5 ]

‖n. [ L., fr. Gr. &unr_;, fr. &unr_; to turn to the opposite side; 'anti` against + &unr_; to turn. See Strophe. ] 1. In Greek choruses and dances, the returning of the chorus, exactly answering to a previous strophe or movement from right to left. Hence: The lines of this part of the choral song. [ 1913 Webster ]

It was customary, on some occasions, to dance round the altars whilst they sang the sacred hymns, which consisted of three stanzas or parts; the first of which, called strophe, was sung in turning from east to west; the other, named antistrophe, in returning from west to east; then they stood before the altar, and sang the epode, which was the last part of the song. Abp. Potter. [ 1913 Webster ]

2. (Rhet.) (a) The repetition of words in an inverse order; as, the master of the servant and the servant of the master. (b) The retort or turning of an adversary's plea against him. [ 1913 Webster ]

a. [ Gr. &unr_;. ] Of or pertaining to an antistrophe. [ 1913 Webster ]

‖n. [ Gr. &unr_; turned opposite ways. ] (Rhet.) An argument retorted on an opponent. Milton. [ 1913 Webster ]

‖n. (Anat.) An articular surface on the ilium of birds against which the great trochanter of the femur plays. [ 1913 Webster ]

{ } a. [ Pref. anti- + Gr. &unr_; turn, &unr_; to turn. ] (Bot.) At the extremity most remote from the hilum, as the embryo, or inverted with respect to the seed, as the radicle. Lindley. [ 1913 Webster ]

a. [ From L. ante + versun turned; apparently formed in imitation of retrorse. ] (Bot.) Forward or upward in direction. Gray. [ 1913 Webster ]

v. t. To bend forward. [ R. ] Owen. [ 1913 Webster ]

‖n. [ Gr. &unr_; from + &unr_; star. ] (Astron.) That point in the orbit of a double star where the smaller star is farthest from its primary. [ 1913 Webster ]

a. [ Gr. &unr_; + &unr_; sun + &unr_; belonging to a turning. ] Turning away from the sun; -- said of leaves, etc. Darwin. [ 1913 Webster ]

n. The habit of bending from the sunlight; -- said of certain plants. [ 1913 Webster ]

a. [ Pref. apo- + Gr. &unr_; earth + &unr_; turning. ] (Bot.) Bending away from the ground; -- said of leaves, etc. Darwin. [ 1913 Webster ]

n. The apogeotropic tendency of some leaves, and other parts. [ 1913 Webster ]

n. [ (1) L., fr. Gr. &unr_; a turning away, fr. &unr_; to turn away; &unr_; from + &unr_; to turn. (2) F., fr. L. apostrophus apostrophe, the turning away or omitting of a letter, Gr. &unr_;. ] 1. (Rhet.) A figure of speech by which the orator or writer suddenly breaks off from the previous method of his discourse, and addresses, in the second person, some person or thing, absent or present; as, Milton's apostrophe to Light at the beginning of the third book of “Paradise Lost.” [ 1913 Webster ]

2. (Gram.) The contraction of a word by the omission of a letter or letters, which omission is marked by the character [ ' ] placed where the letter or letters would have been; as, call'd for called. [ 1913 Webster ]

3. The mark [ ' ] used to denote that a word is contracted (as in ne'er for never, can't for can not), and as a sign of the possessive, singular and plural; as, a boy's hat, boys' hats. In the latter use it originally marked the omission of the letter e. [ 1913 Webster ]

The apostrophe is used to mark the plural of figures and letters; as, two 10's and three a's. It is also employed to mark the close of a quotation. [ 1913 Webster ]

a. Pertaining to an apostrophe, grammatical or rhetorical. [ 1913 Webster ]

v. t., [ imp. & p. p. Apostrophized p. pr. & vb. n. Apostrophizing. ] 1. To address by apostrophe. [ 1913 Webster ]

2. To contract by omitting a letter or letters; also, to mark with an apostrophe (') or apostrophes. [ 1913 Webster ]

v. i. To use the rhetorical figure called apostrophe. [ 1913 Webster ]

n. [ Gr. 'apotro`paios averting evil. ] Intended to protect from evil. [ PJC ]