sinus

Meaning

1. A pouch or cavity in a bone or other tissue, especially one in the bones of the face or skull connecting with the nasal cavities (the paranasal sinus).
2. An irregular venous or lymphatic cavity, reservoir, or dilated vessel.
3. An irregular venous or lymphatic cavity, reservoir, or dilated vessel.
4. An abnormal cavity or passage such as a fistula, leading from a deep-seated infection and discharging pus to the surface.
5. A rounded notch or depression between two lobes or teeth in the margin of a leaf or petal.
6. A bay of the sea; a recess in the shore.
7. Synonym of sine.

Synonyms

fistula

gulf

sine

cavity

bay

venous sinus

gap

hatch

lap

leak

loch

lumen

nook

opening

orifice

socket

trick

vagina

coelenteron

bodily cavity

sinusoidal envelope

antrum

medium sinus

aperture

basin

bend

concavity

dent

Pronounced as (IPA)

/ˈsaɪ.nəs/

Etymology

Learned borrowing from Latin sinus (“a bent surface, curve, hollow”). Doublet of sine.