acorn
Pronunciation:
/ˈeɪ.kɔːn//ˈeɪ.kɔɹn/noun
Definitions
The fruit of the oak, being an oval nut growing in a woody cup or cupule.
A cone-shaped piece of wood on the point of the spindle above the vane, on the mast-head.
See acorn-shell.
(usually in the plural) A testicle.