yes
An OS is a mouth-like opening. An example are internal and external cervical OS
The Latin words for mouth or opening are os and ostium. Os meaning mouth, mask, bone, opening. Ostium meaning door, mouth, entrance, gate, or exit.
Os is from the old Latin word meaning mouth. It is used today to mean an opening or entrance to a passage, esp. one at either end of the cervix of the uterus.
By Mouth (per Os) Or Orally
There is one opening that serves as both mouth and anus
per OS (latin for 'through the mouth' = (drug administration) orally)
x = 10 (mg, g, etc) PO = per os (by mouth)
The outer cervical os is the opening in the uterine cervix (the neck of the uterus) closer to the vagina. Its counterpart is the interior cervical os, which is opening in the cervix closer to the uterus.
Os
Just to add that p.o it is the initials of the words, Per Os= By mouth
Os is the zoology term meaning mouth.
In protostome ("first mouth") the blastopore, or the first opening formed becomes the mouth. In deuterostomes ("second mouth"), the blastopore forms the anus and the mouth develops from a second opening.