Aculeus

n.	1.	(Bot.) A prickle growing on the bark, as in some brambles and roses.
	2.	(Zool.) A sting.

Noun	1.	aculeus - a stiff sharp-pointed plant process
	2.	aculeus - a sharp-pointed process especially a sting of a hymenopterous insect

enation, plant process, pricker, prickle, spine, sticker, thorn