a small secretory cavity, sac, or gland, in particular:
a parasitic mite which burrows into the hair follicles, causing demodectic mange
a fluid-filled structure in the mammalian ovary within which an ovum develops prior to ovulation
another term for Graafian follicle.
a hormone secreted by the anterior pituitary gland which promotes the formation of ova or sperm
the sheath of cells and connective tissue which surrounds the root of a hair