OS

I. ˈäs noun

( plural os·sa -sə)

Etymology: Latin oss-, os — more at osseous

: bone

II. noun

( plural ora ˈōrə)

Etymology: Latin or-, os — more at oral

: mouth , orifice

III. noun

also ose ˈōs

( plural osar ˈōˌsär ; also oses )

Etymology: Swedish ås mountain ridge, from Old Norse āss — more at humerus

: esker