cucullus

‖n.; pl. Cuculli /plu>. [ L., a hood. ] 1. (Bot.) A hood-shaped organ, resembling a cowl or monk's hood, as certain concave and arched sepals or petals. [ Webster 1913 Suppl. ]

2. (Zool.) A color marking or structure on the head somewhat resembling a hood. [ Webster 1913 Suppl. ]