{ a. [ L. Achaeus, Achaius; Gr. &unr_;. ] Of or pertaining to Achaia in Greece; also, Grecian. -- n. A native of Achaia; a Greek. [ 1913 Webster ]

‖n. [ F. ] Savage fierceness; ferocity. [ 1913 Webster ]

n. An agate. [ Obs. ] Evelyn. [ 1913 Webster ]

n. [ F. achat purchase. See Cates. ] [ 1913 Webster ]

1. Purchase; bargaining. [ Obs. ] Chaucer. [ 1913 Webster ]

2. pl. Provisions. Same as Cates. [ Obs. ] Spenser. [ 1913 Webster ]

‖n. [ NL., from Gr. &unr_; agate. ] (Zool.) A genus of land snails, often large, common in the warm parts of America and Africa. [ 1913 Webster ]

n. [ See Cater. ] Purveyor; acater. [ Obs. ] Chaucer. [ 1913 Webster ]

{ } a. [ Gr. 'akro`nychos at nightfall; 'a`kros + ny`x night. ] (Astron.) Rising at sunset and setting at sunrise, as a star; -- opposed to cosmical. [ 1913 Webster ]

☞ The word is sometimes incorrectly written acronical, achronychal, acronichal, and acronical. [ 1913 Webster ]

‖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 ]

n. A mechanic or mechanician expert in the art and practice of aëronautics. [ Webster 1913 Suppl. ]

{ , a. Of or pert. to aëromechanics. [ Webster 1913 Suppl. ]

n. The science of equilibrium and motion of air or an aëriform fluid, including aërodynamics and aërostatics. [ Webster 1913 Suppl. ]

1. A chamber or cavity filled with air, in an animal or plant. [ 1913 Webster ]

2. A cavity containing air to act as a spring for equalizing the flow of a liquid in a pump or other hydraulic machine. [ 1913 Webster ]

‖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 ]

‖n. [ NL., fr. Gr. 'ana` up + xa`ris grace. ] (Bot.) A fresh-water weed of the frog's-bit family (Hydrocharidaceae), native to America. Transferred to England it became an obstruction to navigation. Called also waterweed and water thyme. [ 1913 Webster ]

a. Lawless; anarchical. [ R. ] [ 1913 Webster ]

We are in the habit of calling those bodies of men anarchal which are in a state of effervescence. Landor. [ 1913 Webster ]

n. [ Cf. F. antichambre. ] 1. A chamber or apartment before the chief apartment and leading into it, in which persons wait for audience; an outer chamber. See Lobby. [ 1913 Webster ]

2. A space viewed as the outer chamber or the entrance to an interior part. [ 1913 Webster ]

The mouth, the antechamber to the digestive canal. Todd & Bowman. [ 1913 Webster ]

n. The outer part of the west end of a collegiate or other chapel. Shipley. [ 1913 Webster ]

a. Pertaining to the time before the Passover, or before Easter. [ 1913 Webster ]

n. [ Obs. ] See Antechamber. [ 1913 Webster ]

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

n. The quality of being approachable; approachableness. [ 1913 Webster ]

a. Capable of being approached; accessible; as, approachable virtue. [ 1913 Webster ]

n. The quality or state of being approachable; accessibility. [ 1913 Webster ]

a. [ Gr. 'archai^os ancient, fr. 'archh` beginning. ] Ancient; pertaining to the earliest period in geological history. [ 1913 Webster ]

n. (Geol.) The earliest period in geological period, extending up to the Lower Silurian. It includes an Azoic age, previous to the appearance of life, and an Eozoic age, including the earliest forms of life. [ 1913 Webster ]

☞ This is equivalent to the formerly accepted term Azoic, and to the Eozoic of Dawson. [ 1913 Webster ]

, n. (Microbiol.) A group of single-celled microorganisms including the methanogens and some halophiles and thermoacidophiles, recognized in the 1970's by C. R. Woese and his colleagues as being a distinct group on the basis of RNA sequences, cell walls, and coenzymes differing from those of other microbes. It is believed to be an ancient form of living organism that evolved separately from the eubacteria and blue-green algae. It is classified as a separate kingdom by some taxonomists. See also The Archaebacteria. [ PJC ]

n. [ Gr. 'archai^os ancient + -graphy. ] A description of, or a treatise on, antiquity or antiquities. [ 1913 Webster ]

a. [ Gr. 'archai^os ancient + liqiko`s pertaining to a stone. ] (Archæol.) Of or pertaining to the earliest Stone age; -- applied to a prehistoric period preceding the Paleolithic age. [ 1913 Webster ]

n. An archæologist. [ 1913 Webster ]

{ } Relating to archæology, or antiquities; as, archæological researches. -- Ar`*chæ*o*log"ic*al*ly, adv. [1913 Webster]

n. One versed in archæology; an antiquary. Wright. [ 1913 Webster ]

n. [ Gr. 'archaiologi`a; 'archai^os ancient (fr. 'archh` beginning) + lo`gos discourse, le`gein to speak. ] The science or study of antiquities, esp. prehistoric antiquities, such as the remains of buildings or monuments of an early epoch, inscriptions, implements, and other relics, written manuscripts, etc. [ 1913 Webster ]

‖n. [ Gr. 'archai^os ancient + pte`ryx wing. ] (Paleon.) A fossil bird, of the Jurassic period, remarkable for having a long tapering tail of many vertebræ with feathers along each side, and jaws armed with teeth, with other reptilian characteristics. [ 1913 Webster ]

n. 1. an extinct primitive toothed bird with a long feathered tail and three free clawed digits on each wing. [ WordNet 1.5 ]

n. 1. 1 a subclass of primitive reptilelike fossil birds of the Jurassic or early Cretaceous.
Syn. -- subclass Archaeornithes [ WordNet 1.5 ]

a. [ Gr. 'archai^os ancient + sto`ma mouth. ] (Biol.) Applied to a gastrula when the blastopore does not entirely close up. [ 1913 Webster ]

a. [ Gr. 'archai^os ancient + zw^, on animal. ] (Zool.) Like or belonging to the earliest forms of animal life. [ 1913 Webster ]

2. (Geol.) formed in or belonging to the earlier of two divisions of the Precambrian era. archaeozoic life forms
Syn. -- archeozoic [ WordNet 1.5 ]

n. [ Gr. 'archai^os ancient + zw^, on animal. ] the time from 1.5 billion to 5 billion years ago; the time when the earth's crust formed; a time when only unicellular organisms and the earliest forms of life are present.
Syn. -- Archeozoic, Archeozoic era, Archaeozoic era [ WordNet 1.5 ]

a. [ Gr. 'archai:ko`s old-fashioned, fr. 'archai^os ancient. ] Of or characterized by antiquity or archaism; antiquated; obsolescent. [ 1913 Webster ]

a. Archaic. [ R. ] -- Ar*cha"ic*al*ly, adv. [1913 Webster]

n. [ Gr. 'archai:smo`s, fr. 'archai^os ancient, fr. 'archh` beginning: cf. F. archaïsme. See Arch, a. ] 1. An ancient, antiquated, or old-fashioned, word, expression, or idiom; a word or form of speech no longer in common use. [ 1913 Webster ]

2. Antiquity of style or use; obsoleteness. [ 1913 Webster ]

A select vocabulary corresponding (in point of archaism and remoteness from ordinary use) to our Scriptural vocabulary. De Quincey. [ 1913 Webster ]

n. 1. Am antiquary. [ 1913 Webster ]

2. One who uses archaisms. [ 1913 Webster ]

a. Like, or imitative of, anything archaic; pertaining to an archaism. [ 1913 Webster ]

v. t. [ imp. & p. p. Archaized p. pr. & vb. n. Archaizing. ] [ Gr. 'archai:`zein. ] To make appear archaic or antique. Mahaffy. [ 1913 Webster ]

n. [ L. archangelus, Gr. 'archa`ggelos: cf. OF. archangel, F. archange. See Arch-, pref., and Angel. ] 1. A chief angel; one high in the celestial hierarchy. Milton. [ 1913 Webster ]

2. (Bot.) A term applied to several different species of plants (Angelica archangelica, Lamium album, etc.). [ 1913 Webster ]

a. [ Cf. F. archangélique. ] Of or pertaining to archangels; of the nature of, or resembling, an archangel. Milton. [ 1913 Webster ]

n. [ Cf. G. erzkämmerer. See Arch-, pref. ] A chief chamberlain; -- an officer of the old German empire, whose office was similar to that of the great chamberlain in England. [ 1913 Webster ]

n. [ Cf. Ger. erzkanzler. See Arch-, pref. ] A chief chancellor; -- an officer in the old German empire, who presided over the secretaries of the court. [ 1913 Webster ]

n. A chair with arms to support the elbows or forearms. Tennyson. [ 1913 Webster ]

n. [ From Roger Ascham, who was a great lover of archery. ] A sort of cupboard, or case, to contain bows and other implements of archery. [ 1913 Webster ]