OSES

a bone (used chiefly in latin names of individual bones, e.g. os trapezium).

an opening or entrance to a passage, especially one at either end of the cervix of the uterus.

the chemical element osmium.

(in calculating dates) old style.

open-source.

operating system.

ordinary seaman.

(in the uk) ordnance survey.

(as a size of clothing) outsize.

out of stock.

overseas.