Webster’s Revised Unabridged Dictionary · 1913
Regma
Reg′ma (r?g′m?), n. [NL., fr. Gr. ῥῆγμα, -ατος, fracture, fr. ῥηγνύναι to break.] (Bot.) A kind of dry fruit, consisting of three or more cells, each which at length breaks open at the inner angle.