1.
the plug of mucus that fills the opening of a woman's cervix while she is pregnant.
2.
the flexible bony flap covering the gills of bony fishes
3.
a flap covering an aperture in the spore capsules of mosses and some fungi
4.
a rounded plate that seals the mouth of the shell of some gastropod mollusks when the animal's body is inside
1.
the plug of mucus that fills the opening of a woman's cervix while she is pregnant.
2.
the flexible bony flap covering the gills of bony fishes
3.
a flap covering an aperture in the spore capsules of mosses and some fungi
4.
a rounded plate that seals the mouth of the shell of some gastropod mollusks when the animal's body is inside