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The bony cup which receives the head of the thigh bone.

taining, or derived from, acetyl, as acetic ether, acetic acid. The latter is the acid to which the sour taste of vinegar is due.

A crystalline ketone, CH3COC6H5, which may be obtained by the dry distillation of a mixture of the calcium salts of acetic and benzoic acids. It is used as a hypnotic under the name of hypnone.

omposed. -- Achromatic prism. See Prism. -- Achromatic telescope, or microscope, one in which the chromatic aberration is corrected, usually by means of a compound or achromatic object glass, and which gives images free from extraneous color.

Tissue which is not stained by fluid dyes. W. Flemming.

he achromic point of a starch solution acted upon by an amylolytic enzyme is the point at which it fails to give any color with iodine.

generally with oxygen, and take their names from this negative element or radical. Those which contain no oxygen are sometimes called hydracids in distinction from the others which are called oxygen acids or oxacids.

That variety of either the Bessemer or the open-hearth process in which the converter or hearth is lined with acid, that is, highly siliceous, material. Opposed to basic process.

A group of suctorial Infusoria, which in the adult stage are stationary. See Suctoria.

One of the small grains or drupelets which make up some kinds of fruit, as the blackberry, raspberry, etc.

hood; -- applied to any plant of the genus Aconitum (tribe Hellebore), all the species of which are poisonous.

The involucre or cup in which the acorn is fixed.

A plant which has no cotyledons, as the dodder and all flowerless plants.

Having no seed lobes, as the dodder; also applied to plants which have no true seeds, as ferns, mosses, etc.

wed by in, formerly also by with and to. They were compelled to acquiesce in a government which they did not regard as just. De Quincey.

The act of acquiring, or that which is acquired; attainment. "Rules for the acquirement of a taste." Addison. His acquirements by industry were . . . enriched and enlarged by many excellent endowments of nature. Hayward.

The faculty to which the phrenologists attribute the desire of acquiring and possessing. Combe.

A writing which is evidence of a discharge; a receipt in full, which bars a further demand. You can produce acquittances For such a sum, from special officers. Shak.

The lowest group of Vertebrata, including the amphioxus, in which no skull exists.

tic; bitter; bitterly irritating; as, acrid temper, mind, writing. Acrid poison, a poison which irritates, corrodes, or burns the parts to which it is applied.