Definitions for "Sinus"
A bay of the sea; a recess in the shore.
A cavity; a depression.
A cavity in a bone or other part, either closed or with a narrow opening.
An opening; a hollow; a bending.
A depression between adjoining lobes.
n. (L. a bent surface, a curve, a fold or hollow, bosom, a bay) the rounded depression between two consecutive lobes. as of a leaf. pl. sinuses, sinus.
Enlarged portion of the duct where breastmilk pools during letdown. It lies directly behind the areola and connects to nipple pore.
a blind-ending track opening onto the body surface, which is usually caused by the presence of an abscess, or foreign material which is an irritant and has become a focus for infection e
A blind ending track opening onto an epithelial surface and lined by granulation tissue.
Keywords:  saclike, drainage, tag, tiny, mass
a saclike structure with a single drainage site ) A skin tag is a tiny mass of skin in the same location
Keywords:  petals, groove, opening, bases, two
an opening or groove, as between the bases of two petals.
Keywords:  plain, moon, planet, large
a large plain on a planet or a moon
a wide channel containing blood; does not have the coating of an ordinary blood vessel