Aculeus

A`cu´le`us

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

Thesaurus

Noun	1.	aculeus - a stiff sharp-pointed plant process plant process, enation - a natural projection or outgrowth from a plant body or organ pricker, prickle, spikelet, sticker, thorn, spine - a small sharp-pointed tip resembling a spike on a stem or leaf
	2.	aculeus - a sharp-pointed process especially a sting of a hymenopterous insect stinger - a sharp organ of offense or defense (as of a wasp or stingray or scorpion) often connected with a poison gland