n. an airheaded person. [ disparaging ] [ PJC ]

adj. 1. lacking seriousness; given to frivolity; scatterbrained; stupid; simple-minded; as, airheaded teenagers. Contrasted with serious, solemn
Syn. -- dizzy, empty-headed, featherbrained, giddy, lightheaded, light-headed, silly [ WordNet 1.5 ]

Amenorrhea AS
‖ n. [ Gr. 'a priv. + mh`n month + "rei^n to flow: cf. F. aménorrhée.] (Med.) Pathological or physiological absence of menstruation. [1913 Webster + AS]

‖n. [ Gr. &unr_; mucus + &unr_; to flow. ] (Med.) (a) An inordinate secretion and discharge of mucus. (b) Gonorrhea. Dunglison. [ 1913 Webster ]

n. [ Blunder + head. ] A stupid, blundering fellow. [ 1913 Webster ]

n. The head of a buffer, which recieves the concussion, in railroad carriages. [ 1913 Webster ]

n. [ From its color. ] 1. (Zool.) A poisonous American serpent (Ancistrodon conotortrix), closely allied to the rattlesnake, but without rattles; -- called also copper-belly, and red viper. [ 1913 Webster ]

2. A nickname applied to a person in the Northern States who sympathized with the South during the Civil War. [ U.S. ] [ 1913 Webster ]

{ }, n. [ L. diarrhoea, Gr. dia`rroia, fr. dia`rrei^n to flow through; dia` + "rei^n to flow; akin to E. stream. See Stream.] (Med.) A morbidly frequent and profuse discharge of loose or fluid evacuations from the intestines, without tenesmus; a purging or looseness of the bowels; a flux.

{ } a. (Med.) Of or pertaining to diarrhea; like diarrhea.

n. [ Prov. Eng. also dunderpoll, from dunder, same as thunder. ] A dunce; a numskull; a blockhead. Beau. & Fl. [ 1913 Webster ]

‖n. [ Gr. dys- ill, hard + &unr_; month + &unr_; to flow. ] (Med.) Difficult and painful menstruation. [ 1913 Webster ]

n. pl. (Naut.) The upper extermities of the floor of a vessel. [ 1913 Webster ]

{ } n. [ L. gonorrhoea, Gr. &unr_;; &unr_; that which begets, semen, the genitals + &unr_; to flow: cf. F. gonorrhée. ] (Med.) A contagious inflammatory disease of the genitourinary tract, affecting especially the urethra and vagina, and characterized by a mucopurulent discharge, pain in urination, and chordee; clap. It is caused by infection with the bacterium Neiseria gonorrheae, and is commonly transmitted by sexual intercourse. [ 1913 Webster +PJC ]

{ } a. (Med.) Of or pertaining to gonorrhea; as, gonorrheal rheumatism. [ 1913 Webster ]

n. 1. (Zool.) A shark of the genus Sphyrna or Zygaena, having the eyes set on projections from the sides of the head, which gives it a hammer shape. The Sphyrna zygaena is found in the North Atlantic. Called also hammer fish, and balance fish. [ 1913 Webster ]

2. (Zool.) A fresh-water fish; the stone-roller. [ 1913 Webster ]

3. (Zool.) An African fruit bat (Hypsignathus monstrosus); -- so called from its large blunt nozzle. [ 1913 Webster ]

{ } n. [ See Jolt, Jowl. ] A dunce; a blockhead. Sir T. North. [ 1913 Webster ]

n. (Zool.) The friar bird. [ 1913 Webster ]

n. [ Log + head. ] 1. A blockhead; a dunce; a numskull. Shak. Milton. [ 1913 Webster ]

2. A spherical mass of iron, with a long handle, used to heat tar. [ 1913 Webster ]

3. (Naut.) An upright piece of round timber, in a whaleboat, over which a turn of the line is taken when it is running out too fast. Ham. Nav. Encyc. [ 1913 Webster ]

4. (Zool.) A very large marine turtle (Thalassochelys caretta syn. Thalassochelys caouana), common in the warmer parts of the Atlantic Ocean, from Brazil to Cape Cod; -- called also logger-headed turtle. [ 1913 Webster ]

5. (Zool.) An American shrike (Lanius Ludovicianus), similar to the butcher bird, but smaller. See Shrike. [ 1913 Webster ]

To be at loggerheads,
To fall to loggerheads, or
To go to loggerheads, to quarrel; to be at strife. L' Estrange. [ 1913 Webster ]

a. Dull; stupid. Shak. [ 1913 Webster ]

A rabble of loggerheaded physicians. Urquhart. [ 1913 Webster ]

n. (Bot.) The knapweed. [ 1913 Webster ]

n. A strong black chewing tobacco, usually in twisted plug form; negro head. [ archaic ] [ Webster 1913 Suppl. ]

n. The warhead of a missile containing an atom bomb or hydrogen bomb.
Syn. -- atomic warhead, thermonuclear warhead, nuke. [ WordNet 1.5 ]

adv. Aloft; above; in or attached to the ceiling or roof; in the story or upon the floor above; in the zenith. [ 1913 Webster ]

While overhead the moon
Sits arbitress. Milton. [ 1913 Webster ]

Also used adjectively; as, an overhead crane, gear, etc. [ 1913 Webster ]

Overhead engine, a vertical steam engine in which the cylinder stands above the crank. --
Overhead work, a general term in manufactories for countershafting and gearing, when overhead. [ 1913 Webster ]

n. 1. same as overhead expenses. [ PJC ]

2. A compartment on a train, bus, or airplane used for storage of luggage or accessory equipment; called also overhead compartment. [ PJC ]

3. (Sports) A stroke with a racket in which the ball is struck with the racket over the head, moving in a downward motion; also called overhead stroke. [ PJC ]

{ etc. } (Accounting) Those general charges or expenses in any business which cannot be charged up as belonging exclusively to any particular part of the work or product, as where different kinds of goods are made, or where there are different departments in a business; -- called also fixed charges, establishment charges, or (in a manufacturing business) administration charges, selling charges, and distribution charges, etc. [ Webster 1913 Suppl. ]

v. t. [ imp. & p. p. Overheard p. pr. & vb. n. Overhearing. ] [ AS. oferhiéran. ] [ 1913 Webster ]

1. To hear more of (anything) than was intended to be heard; to hear by accident or artifice. Shak. [ 1913 Webster ]

2. To hear again. Shak. [ 1913 Webster ]

v. t. [ Cf. Superheat. ] To heat to excess; to superheat. Cowper. [ 1913 Webster ]

a. Excessively heavy. [ 1913 Webster ]

n. (Bot.) The ramie or grass-cloth plant. See Grass-cloth plant, under Grass. [ 1913 Webster ]

n. [ L., a proper name. ] (Zool.) Any one of three species of large South American ostrichlike birds of the genera Rhea and Pterocnemia. Called also the American ostrich. [ 1913 Webster ]

☞ The common rhea, or nandou (Rhea Americana), ranges from Brazil to Patagonia. Darwin's rhea (Pterocnemia Darwinii), of Patagonia, is smaller, and has the legs feathered below the knee. [ 1913 Webster ]

‖n. pl. [ NL. ] (Zool.) A suborder of struthious birds including the rheas. [ 1913 Webster ]

n. (Naut.) The upper end of the rudderpost, to which the tiller is attached. [ 1913 Webster ]

‖n. [ NL., fr. L. sebum tallow + Gr. &unr_; to flow. ] (Med.) A morbidly increased discharge of sebaceous matter upon the skin; stearrhea. [ 1913 Webster ]

n. The pointed head, or end, of a spear. [ 1913 Webster ]

{ } n. [ NL., fr. Gr. spe`rma, -atos, seed + &unr_;&unr_;&unr_; to flow. ] (Med.) Abnormally frequent involuntary emission of the semen without copulation. [ 1913 Webster ]

n. The head or top of a staircase. [ 1913 Webster ]

‖n. [ NL., from Gr. ste`ar tallow + "rei^n to flow.] (Med.) Seborrhea. [1913 Webster]

v. t. [ imp. & p. p. Superheated; p. pr. & vb. n. Superheating. ] 1. To heat too much, to overheat; as, to superheat an oven. [ 1913 Webster ]

2. (Steam Engine) To heat, as steam, apart from contact with water, until it resembles a perfect gas. [ 1913 Webster ]

3. To heat (a liquid) above its boiling point without converting it into vapor. [ Webster 1913 Suppl. ]

n. The increase of temperature communicated to steam by superheating it. [ 1913 Webster ]

heated to a temperature above the boiling point at the ambient pressure; -- said of liquids. In such an unstable condition, a small disturbance of the liquid can cause a rapid and sometimes violent ebullition of vapor. [ PJC ]

n. (Steam Engine) An apparatus for superheating steam. [ 1913 Webster ]

n. A rounded mass of cloud, with shining white edges; a cumulus, -- often appearing before a thunderstorm. [ 1913 Webster ]

n. (Naut.) The top end of a timber, rising above the gunwale, and serving for belaying ropes, etc.; -- called also kevel head. [ 1913 Webster ]

n. A blockhead, or stupid person; a dunderhead. [ Obs. ] Sir T. Browne. [ 1913 Webster ]

v. i. To heave or lift from below. [ Obs. ] Wyclif. [ 1913 Webster ]