Cupule vs. Acorn — What's the Difference?

A small cup-shaped structure or organ, such as the cup at the base of an acorn or one of the suckers on the feet of certain flies.

The acorn, or oaknut, is the nut of the oaks and their close relatives (genera Quercus and Lithocarpus, in the family Fagaceae). It usually contains one seed (occasionally two seeds), enclosed in a tough, leathery shell, and borne in a cup-shaped cupule.

Any small structure shaped like a cup, such as at the base of an acorn, or the sucker on the feet of some flies.

The fruit of an oak, consisting of a single-seeded, thick-walled nut set in a woody, cuplike base.

A cuplet or little cup, as of the acorn; the husk or bur of the filbert, chestnut, etc.

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

A sucker or acetabulum.

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

Cup-shaped structure of hardened bracts at the base of an acorn

(zoology) See acorn-shell.

A sucker on the feet of certain flies

The glans penis.

A testicle.

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.

Fruit of the oak tree: a smooth thin-walled nut in a woody cup-shaped base