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Having a sour taste; sour; acid. "An acetous spirit." Boyle. "A liquid of an acetous kind." Bp. Lowth.

A river in the Nether World or infernal regions; also, the infernal regions themselves. By some of the English poets it was supposed to be a flaming lake or gulf. Shak.

side; -- used specif. in designating the position of an army with the wings separated by some line of demarcation, as a river or road.

To obtain, or gain, as the result of exertion; to succeed in gaining; to win. Some are born great, some achieve greatness. Shak. Thou hast achieved our liberty. Milton.

A great or heroic deed; something accomplished by valor, boldness, or praiseworthy exertion; a feat. [The exploits] of the ancient saints . . . do far surpass the most famous achievements of pagan heroes. Barrow. The highest achievements of the human intellect. Macaulay.

ns of the large muscles in the calf of the leg, an inserted into the bone of the heel; -- so called from the mythological account of Achilles being held by the heel when dipped in the River Styx.

Uncolored; not absorbing color from a fluid; -- said of tissue. Achromatic lens (Opt.), a lens composed usually of two separate lenses, a convex and concave, of substances having different refractive and dispersive powers, as crown and flint glass, with the curvatures so adjusted that the chromatic aberration produced…

Free from color; colorless; as, in Physiol. Chem., the 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.

One of the needlelike or bristlelike spines or prickles of some animals and plants; also, a needlelike crystal.

Needle-shaped; slender like a needle or bristle, as some leaves or crystals; also, having sharp points like needless. A*cic"u*lar*ly, adv.

Sour, sharp, or biting to the taste; tart; having the taste of vinegar: as, acid fruits or liquors. Also fig.: Sour-tempered. He was stern and his face as acid as ever. A. Trollope.

Containing a high percentage of silica; -- opposed to basic. an acidic solution.

To sour; to imbitter. His thin existence all acidified into rage. Carlyle.

The quality of being sour; sourness; tartness; sharpness to the taste; as, the acidity of lemon juice.

Sourly; tartly.

Acidity; sourness.

To make sour or acid in a moderate degree; to sour somewhat. Arbuthnot.

Having an acid quality; sour; acidulous. "With anxious, acidulent face." Carlyle.

Slightly sour; sub-acid; sourish; as, an acidulous tincture. E. Burke. Acidulous mineral waters, such as contain carbonic anhydride.

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