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A triangle having three acute angles.

Having acute angles. Barlow.

Excessive acuteness of sight.

Acuteness or shrillness of voice.

Having an acute sound; (Gr. Gram.), having an acute accent on the last syllable.

A word having an acute accent on the penultimate syllable.

Acute; discerning; sagacious; quick to discover; as, a penetrating mind.

Acuteness; insight; sharp discoverment; sagacity; as, a person of singular penetration. Walpole.

Acute; discerning; sagacious; as, penetrative wisdom. "The penetrative eye." Wordsworth. Led on by skill of penetrative soul. Grainger.

Fig.: Of acute discernment; keen. -- Per`spi*ca"cious*ly, adv. -- Per`spi*ca"cious*ness, n.

The state of being perspicacious; acuteness of sight or of intelligence; acute discernment. Sir T. Browne.

Inflammation of the brain, or of the meninges of the brain, attended with acute fever and delirium; -- called also cephalitis.

The relative acuteness or gravity of a tone, determined by the number of vibrations which produce it; the place of any tone upon a scale of high and low.

An acute malignant contagious fever, that often prevails in Egypt, Syria, and Turkey, and has at times visited the large cities of Europe with frightful mortality; hence, any pestilence; as, the great London plague. "A plague upon the people fell." Tennyson. Cattle plague. See Rinderpest. -- Plague mark, Plague spot,…

To give a point to; to sharpen; to cut, forge, grind, or file to an acute end; as, to point a dart, or a pencil. Used also figuratively; as, to point a moral.

A word which has the acute accent on the antepenult.

Acute of smell.

Having quick sight or acute discernment; quick to see or to discern. Locke. --Quick"-sight`ed*ness, n.

Acuteness of perception; keen sensibility. Would not quickness of sensation be an inconvenience to an animal that must lie still Locke

for light; a biaxial crystal is similarly designated when the same relation holds for the acute bisectrix. -- Index of refraction. See under Index. -- Refraction circle (Opt.), an instrument provided with a graduated circle for the measurement of refraction. -- Refraction of latitude, longitude, declination, right a…