Definitions for: Aculeus

[n] a sharp-pointed process especially a sting of a hymenopterous insect
[n] a stiff sharp-pointed plant process

Webster (1913) Definition: A*cu"le*us, n.; pl. Aculei. [L., dim. of acus
needle.]
1. (Bot.) A prickle growing on the bark, as in some brambles
and roses. --Lindley.

2. (Zo["o]l.) A sting.

See Also: enation, plant process, pricker, prickle, spine, sticker, stinger, thorn