How do you spell Follicle

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