The flap of mucosa over a partially erupted tooth.
A lid covering a flower, bud or fruit.
A part of the cerebral hemisphere which overlaps the insula.
A plug of mucus which can block the cervical canal during pregnancy.
Opercula, lid, covering, or plug, as the mucous plug that closes the uterus during pregnancy.
A plug of mucus that blocks the cervical canal of the womb in a pregnant woman.