Acorn vs Knoppern - What's the difference?
acorn | knoppern |
The fruit of the oak, being an oval nut growing in a woody cup or cupule.
(nautical) A cone-shaped piece of wood on the point of the spindle above the vane, on the mast-head.
(zoology) See acorn-shell .
(slang, usually in plural) A testicle.
A kind of gall produced by a gallfly on the cup of an acorn, and formerly used in tanning and dyeing.
(Webster 1913)