Definition of aculeus in English:

aculeus

noun

  • 1Botany. A sharply pointed projection on a plant, such as a thorn or a spine; especially one growing directly from the epidermis or forming an extension of it.

  • 2Zoology. The sting of an insect or other animal.

Origin

Early 17th century (in an earlier sense). From classical Latin acūleus sting, spine, thorn, barb, spike, prick, pang from acus needle + -leus, suffix forming diminutives.

Pronunciation

aculeus

/əˈkjuːlɪəs/