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plural acorns
The fruit of the oak, being an oval nut growing in a woody cup or cupule. examples
(nautical) A cone-shaped piece of wood on the point of the spindle above the vane, on the mast-head. examples
(zoology) See acorn-shell.
The glans penis. quotations examples
The Romans, likewise, represented the uncouth Priapus—the god of rustic fertility and sexual assault—as comically well endowed, with his acorn showing.
2021, A. W. Strouse, Form & Foreskin: Medieval Narratives of Circumsion
(slang, usually in the plural) A testicle.