Definition of "acorn" in Englisch

noun

1. The fruit of the oak, being an oval nut growing in a woody cup or cupule.

2. (nautical) A cone-shaped piece of wood on the point of the spindle above the vane, on the mast-head.

3. (zoology) See acorn-shell.

4. (informal) The glans penis.

5. (slang, usually in the plural) A testicle.