aculeus

aculeus

(əˈkjuːlɪəs) n1. (Botany) a prickle or spine, such as the thorn of a rose2. (Zoology) a sting or ovipositor[C19: from Latin, diminutive of acus needle]

Thesaurus

Noun	1.	aculeus - a stiff sharp-pointed plant processplant process, enation - a natural projection or outgrowth from a plant body or organpricker, 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 insectstinger - a sharp organ of offense or defense (as of a wasp or stingray or scorpion) often connected with a poison gland