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An opening; a hollow; a bending.

The curve whose ordinates are proportional to the sines of the abscissas, the equation of the curve being y = a sin x. It is also called the curve of sines.

Of or pertaining to a sinusoid; like a sinusoid.

A cavern or cavity, esp. an anatomical cavity or sinus. Huxley.

A South American monkey, the ursine howler (Mycetes ursinus). See Howler, n., 2.

A quadruped of the genus Equus (E. asinus), smaller than the horse, and having a peculiarly harsh bray and long ears. The tame or domestic ass is patient, slow, and sure-footed, and has become the type of obstinacy and stupidity. There are several species of wild asses which are swift-footed.

ft to the middle or slightly beyond the middle; opening with a cleft; divided by a linear sinus, with straight margins.

The striped quagga, or Burchell's zebra, of South Africa (Asinus Burchellii); -- called also peechi, or peetsi.

devil (Zoöl.), a very savage carnivorous marsupial of Tasmania (Dasyurus, or Diabolus, ursinus). -- To play devil with, to molest extremely; to ruin. [Low]

The kiang, a wild horse or wild ass of Thibet (Asinus hemionus).

Having the margin interrupted by a notch or shallow sinus.

ching or indenting the margin, or the state of being so notched; also, a notch or shallow sinus in a margin.

a coat of fine and soft fur which is highly prized. The northern fur seal (Callorhinus ursinus) breeds in vast numbers on the Prybilov Islands, off the coast of Alaska; -- called also sea bear.

Having the pallial line entire, or without a sinus, as certain bivalve shells.

Between the cavernous sinuses; as, the intercavernous sinuses connecting the cavernous sinuses at the base of the brain.

A wild horse (Equus, or Asinus, onager) inhabiting the plants of Central Asia; -- called also gour, khur, and onager. [Written also kulan.]

Having many segments; cleft into several parts by linear sinuses; as, a multifid leaf or corolla.

lust. of Bivalve. Pallial chamber (Zoöl.), the cavity inclosed by the mantle. -- Pallial sinus (Zoöl.), an inward bending of the pallial line, near the posterior end of certain bivalve shells, to receive the siphon. See Illust. of Bivalve.

ning the depth or other circumstances of a wound, ulcer, or cavity, or the direction of a sinus, of for exploring for bullets, for stones in the bladder, etc. Parr. Probe, or Probe-pointed, scissors (Surg.), scissors used to open wounds, the blade of which, to be thrust into the orifice, has a button at the end. Wisema…

A sinus.