Emily Dickinson Lexicon

A-CU'LE-ATE, a. [L. aculeus, from acus, Gr. ακη, a point, and the diminutive ul. See Acid.]

1. In botany, having prickles, or sharp points; pointed; used chiefly to denote prickles fixed in the bark, in distinction from thorns, which grow from the wood. – Milne.
2. In zoology, having a sting.