(zoology) Any gastropod in the family Cassidae.

(botany) Shaped like a helmet; applied to a corolla with a broad, helmet-shaped upper petal, as in aconite.

plural of cassid

A surname from Irish anglicized from Ó Caiside (“descendant of Caiside”). Caiside is a byname from Irish cas (“curly”) meaning “curly-haired”.

(mineralogy) A triclinic-pinacoidal mineral containing calcium, hydrogen, magnesium, nickel, oxygen, and phosphorus.

plural of cassidony

French lavender (Lavandula stoechas). / goldilocks (Galatella linosyris, syn. Aster linosyris) and perhaps other plants related to the genus Gnaphalium or cudweed. / Chalcedony

Any sea urchin of the order Cassiduloida.

plural of cassiduloid

A surname.