églantier

wild rosebush (either sweetbriar or dog rose)

From Middle French [Term?], from Old French aiglantier, eglenter, eglentier, from aiglant (“wild rosebush”) + -ier, with the first element derived from an apparent Vulgar Latin *aquilentum, an irregular derivative of Latin aculeus (“sting, prickle”) + -ulentum (“full of”), possibly a substantivized adjective. The later addition of the suffix -ier is in line with several French names of trees, compare pommier (“apple-tree”), from pomme (“apple”) + -ier, or genévrier (“juniper tree”), from genièvr