Os

Definition:

• (n.) A bone.
• (n.) A mouth; an opening; an entrance.
• (n.) One of the ridges of sand or gravel found in Sweden, etc., supposed by some to be of marine origin, but probably formed by subglacial waters. The osar are similar to the kames of Scotland and the eschars of Ireland. See Eschar.

Compare os with other words:

orifice vs. os

esker vs. os

os vs. osar

external vs. os

os vs. uterus

opening vs. os

mouth vs. os

internal vs. os

cervix vs. os

os vs. outsize

oculus vs. os

os vs. sinister