Definition of follicle

• n. - A simple podlike pericarp which contains several seeds and opens along the inner or ventral suture, as in the peony, larkspur and milkweed.
• n. - A small cavity, tubular depression, or sac; as, a hair follicle.
• n. - A simple gland or glandular cavity; a crypt.
• n. - A small mass of adenoid tissue; as, a lymphatic follicle.