Os

Etymology 1
From Proto-Indo-European *ōs.

Noun
os (plural osos)
 * 1) mouth
 * 2) entrance
 * 3) muzzle

Derived words

 * osin (n), kiss.
 * osok (adj), bucal.
 * osoz (v), to enter.

Etymology 2
See etymology of the main entry.

Noun
os
 * 1) Singular privative inflected form of o.