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Sour, bitter, and harsh to the taste, as unripe fruit; sharp and harsh.

Needle-shaped, having a sharp, rigid point, as the leaf of the pine.

eedle-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.

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

Sharp and harsh, or bitter and not, to the taste; pungent; as, acrid salts.

A quality of bodies which corrodes or destroys others; also, a harsh or biting sharpness; as, the acrimony of the juices of certain plants. [Archaic] Bacon.

Sharpness; keenness. [Obs.]

To sharpen; to make pungent; to quicken. [Obs.] "[To] acuate the blood." Harvey.

Act of sharpening. [R.]

The act of sharpening. [Obs.]

Sharpness or acuteness, as of a needle, wit, etc.

Having a sting; covered with prickles; sharp like a prickle.

Having a sharp point; armed with prickles; prickly; aculeate.

Having small prickles or sharp points. Gray.

To render sharp or keen. [R.] "To acuminate even despair." Cowper.

A sharpening; termination in a sharp point; a tapering point. Bp. Pearson.

Sharp at the end; ending in a sharp point; pointed; -- opposed to blunt or obtuse; as, an acute angle; an acute leaf.

In an acute manner; sharply; keenly; with nice discrimination.

The quality of being acute or pointed; sharpness; as, the acuteness of an angle.