calyculus 🔊 Listen to this < /kəˈlɪk yəˌlaɪ/. Zoology. Also caliculus. a structure shaped like a cup. Botany. a set of bracts resembling an outer calyx. A.Word.A.Day –calyculus Craterellus calyculus (Liberal Dictionary) Calyculus: A small cup shaped structure. | Botany word of the day Nature Picture Library – Mermaid’s wineglass algae (Acetabularia Share Facebook Twitter Google +