Breadcrumb Home > Dictionary > Index P prickly ash: Meaning and Definition of Find definitions for: prick'ly ash' Pronunciation: [key] Also calleda citrus shrub or small tree, Zanthoxylum americanum, having aromatic leaves and usually prickly branches. Hercules-club (def. 2). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. prickly prickly heat ✖ Related Content Daily Word Quiz: deracinate Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language