*eta*

a. Cup-shaped; saucer-shaped; acetabuliform. [ 1913 Webster ]

‖n. pl. [ NL. See Acetabuliferous. ] (Zool.) The division of Cephalopoda in which the arms are furnished with cup-shaped suckers, as the cuttlefishes, squids, and octopus; the Dibranchiata. See Cephalopoda. [ 1913 Webster ]

a. [ L. acetablum a little cup + -ferous. ] Furnished with fleshy cups for adhering to bodies, as cuttlefish, etc. [ 1913 Webster ]

a. [ L. acetabulum + -form. ] (Bot.) Shaped like a shallow cup; saucer-shaped; as, an acetabuliform calyx. Gray. [ 1913 Webster ]

‖n. [ L., a little saucer for vinegar, fr. acetum vinegar, fr. acere to be sour. ] [ 1913 Webster ]

1. (Rom. Antiq.) A vinegar cup; socket of the hip bone; a measure of about one eighth of a pint, etc. [ 1913 Webster ]

2. (Anat.) (a) The bony cup which receives the head of the thigh bone. (b) The cavity in which the leg of an insect is inserted at its articulation with the body. (c) A sucker of the sepia or cuttlefish and related animals. (d) The large posterior sucker of the leeches. (e) One of the lobes of the placenta in ruminating animals. [ 1913 Webster ]

n. [ Acetic + alcohol. ] (Chem.) A limpid, colorless, inflammable liquid from the slow oxidation of alcohol under the influence of platinum black. [ 1913 Webster ]

n. Acetic aldehyde. See Aldehyde. [ 1913 Webster ]

n. [ Acetyl + amide. ] (Chem.) A white crystalline solid, from ammonia by replacement of an equivalent of hydrogen by acetyl. [ 1913 Webster ]

n. 1. a white crystalline compound (HO.C6H4.NH.CO.CH3) used as an analgesic and also as an antipyretic. It has molecular weight 151.16. It is the active ingredient in the commercial analgesics Tylenol and Datril.
Syn. -- p-hydroxyacetanilide, p-acetamidophenol, N-acetyl-p-aminophenol, paracetamol, N-(4-hydroxyphenyl)acetamide It is sold under many trade names, and has been one of the most popular analgesics in the late 20th century. It is used in place of aspirin by people in whom aspirin causes undesirable side effects, such as stomach irritation or stomach bleeding. [ PJC ]

n. [ Acetyl + anilide. ] (Med., Chem.) An amide formed from aniline and an acetyl group (C6H5.NH.CO.CH3); it is a white crystalline compound used as an analgesic and also as an antipyretic. It has molecular weight 135.16. [ Written also acetanilid ] AS
Syn. -- phenylacetamide, N-phenylacetamide, antifebrin, antifebrine, acetylaminobenzene, acetylaniline [ 1913 Webster + WordNet 1.5 + AS ]

a. [ L. acetaria, n. pl., salad, fr. acetum vinegar, fr. acere to be sour. ] Used in salads; as, acetarious plants. [ 1913 Webster ]

n. [ L. acetaria salad plants. ] An acid pulp in certain fruits, as the pear. Grew. [ 1913 Webster ]

n. [ L. acetum vinegar, fr. acere to be sour. ] (Chem.) A salt formed by the union of acetic acid with a base or positive radical; as, acetate of lead, acetate of potash. [ 1913 Webster ]

a. Combined with acetic acid. [ 1913 Webster ]

n. 1. a genus of Orthopteran insects consisting of common house and field crickets.
Syn. -- genus Acheta [ WordNet 1.5 ]

‖n. pl. [ NL., fr. Gr. 'akinhtos immovable. ] (Zool.) A group of suctorial Infusoria, which in the adult stage are stationary. See Suctoria. [ 1913 Webster ]

a. [ Gr. 'a`kros summit + L. petere to seek. ] (Bot.) Developing from below towards the apex, or from the circumference towards the center; centripetal; -- said of certain inflorescence. [ 1913 Webster ]

n. 1. 1 filamentous or rod-shaped bacteria.
Syn. -- order Actinomycetales [ WordNet 1.5 ]

A kind of gun metal, containing copper, zinc, and iron, but no tin. [ 1913 Webster ]

n. See Aleconner. [ Eng. ] [ 1913 Webster ]

. Any one of the univalent metals of group I of the periodic table of the elements, including lithium, sodium, potassium, rubidium, cesium, and francium. The hydroxides of these metals are soluble in water and form strongly basic solutions. [ PJC. ]

n. A learner of the alphabet; an abecedarian. Abp. Sancroft. [ 1913 Webster ]

‖n. pl. [ NL. ] (Zool.) A group of insects which do not undergo any metamorphosis. [ Written also Ametabolia. ] [ 1913 Webster ]

a. [ Gr. &unr_; unchangeable; 'a priv. + &unr_; changeable, &unr_; to change. ] (Zool.) Of or pertaining to insects that do undergo any metamorphosis. [ 1913 Webster ]

{ } a. (Zool.) Not undergoing any metamorphosis; as, ametabolic insects. Opposite of metabolic. [ 1913 Webster ]

2. undergoing only slight metamorphosis [ WordNet 1.5 ]

a. [ Gr. 'anh`r, 'andro`s, man + pe`talon leaf. ] (Bot.) Produced by the conversion of the stamens into petals, as double flowers, like the garden ranunculus. Brande. [ 1913 Webster ]

a. [ Gr. &unr_; unequal + &unr_; leaf. ] (Bot.) Having unequal petals. [ 1913 Webster ]

‖n. [ L., fr. Gr. &unr_;. ] (Rhet.) A figure in which the same words or ideas are repeated in transposed order. [ 1913 Webster ]

‖n. [ NL., fr. Gr. &unr_;. ] (Rhet.) An antithesis in which the members are repeated in inverse order. [ 1913 Webster ]

a. [ Pref. anti- + petal. ] (Bot.) Standing before a petal, as a stamen. [ 1913 Webster ]

a. [ Pref. a- not + petal. ] (Bot.) Having no petals, or flower leaves. [ See Illust. under Anther ]. [ 1913 Webster ]

n. The state of being apetalous. [ 1913 Webster ]

n. [ Gr. &unr_; virtue. ] The ethical theory which excludes all relations between virtue and happiness; the science of virtue; -- contrasted with eudemonics. J. Grote. [ 1913 Webster ]

v. i. [ L. arietatus, p. p. of arietare, fr. aries ram. ] To butt, as a ram. [ Obs. ] [ 1913 Webster ]

n. [ L. arietatio. ] 1. The act of butting like a ram; act of using a battering-ram. [ Obs. ] Bacon. [ 1913 Webster ]

2. Act of striking or conflicting. [ R. ] Glanvill. [ 1913 Webster ]

[ From the inventor, Isaac Babbitt of Massachusetts. ] A soft white alloy of variable composition (as a nine parts of tin to one of copper, or of fifty parts of tin to five of antimony and one of copper) used in bearings to diminish friction. [ 1913 Webster ]

n. 1. State or rank of a baronet. [ 1913 Webster ]

2. The collective body of baronets. [ 1913 Webster ]

A hard alloy or bronze, consisting usually of about three parts of copper to one of tin; -- used for making bells. [ 1913 Webster ]

Bell metal ore, a sulphide of tin, copper, and iron; the mineral stannite. [ 1913 Webster ]

n. [ Gr. bh^ta. ] The second letter of the Greek alphabet, B, β. See B, and cf. etymology of Alphabet. Beta (B, β) is used variously for classifying, as: (a) (Astron.) To designate some bright star, usually the second brightest, of a constellation, as, β Aurigæ. (b) (Chem.) To distinguish one of two or more isomers; also, to indicate the position of substituting atoms or groups in certain compounds; as, β-naphthol. With acids, it commonly indicates that the substituent is in union with the carbon atom next to that to which the carboxyl group is attached. [ Webster 1913 Suppl. ]

{ ‖, n. Excessive or extended use of the b sound in speech, due to conversion of other sounds into it, as through inability to distinguish them from b, or because of difficulty in pronouncing them. [ Webster 1913 Suppl. ]

n. [ From beta, generic name of the beet. ] (Chem.) A nitrogenous base, C5H11NO2, produced artificially, and also occurring naturally in beet-root molasses and its residues, from which it is extracted as a white crystalline substance; -- called also lycine and oxyneurine. It has a sweetish taste. [ 1913 Webster ]

v. t. [ imp. Betook p. p. Betaken p. pr. & vb. n. Betaking. ] [ Pref. be- + take. ] 1. To take or seize. [ Obs. ] Spenser. [ 1913 Webster ]

2. To have recourse to; to apply; to resort; to go; -- with a reflexive pronoun. [ 1913 Webster ]

They betook themselves to treaty and submission. Burke. [ 1913 Webster ]

The rest, in imitation, to like arms
Betook them. Milton. [ 1913 Webster ]

Whither shall I betake me, where subsist? Milton. [ 1913 Webster ]

3. To commend or intrust to; to commit to. [ Obs. ] [ 1913 Webster ]

(Physics) a form of ionizing radiation emitted by radioactive substances (such as radium), more penetrating than alpha rays, and consisting of negatively charged electrons. The electrons are the same kind of particle as those of cathode rays, but have much higher velocities (about 35, 000 to 180, 000 miles per second). They are readily deflected by a magnetic or electric field. [ Webster 1913 Suppl. ]

n. a type of particle accelerator which accelerates a continuous beam of electrons to high speeds by means of the electric field produced by changing magnetic flux.
Syn. -- induction accelerator. [ WordNet 1.5 ]

pos>a. [ p. p. of OE. bitechen, AS. bet&aemacr_;can, to assign, deliver. See Teach. ] Delivered; committed in trust. [ Obs. ] [ 1913 Webster ]

n. a material made by bonding together sheets of two different metals. [ WordNet 1.5 ]

a. [ Pref. bi- + metallic: cf. F. bimétallique. ] 1. Of or relating to, or using, a double metallic standard (as gold and silver) for a system of coins or currency. [ archaic ] [ 1913 Webster ]

2. Composed of two different metals; formed of two parts, each of a different metal; as, bimetallic wire; bimetallic thermometer, etc. [ Webster 1913 Suppl. ]

n. [ F. bimétalisme. ] The legalized use of two metals (as gold and silver) in the currency of a country, at a fixed relative value; -- in opposition to monometallism. [ 1913 Webster ]

☞ The words bimétallisme and monométallisme are due to M. Cernuschi [ 1869 ]. Littré. [ 1913 Webster ]