One of the mysteries of the English language finally explained.
A coelenterate of the family Pennatulidae; a sea pen.
Of or relating to the family Pennatulidae.
Mid 19th century; earliest use found in American Naturalist. From scientific Latin Pennatulidae, family name, alteration of Pennatuladae from Pennatula, genus name (Linnaeus Systema Naturae (ed. 10, 1758) I. 818; from post-classical Latin pennatulus having small wings (late 2nd cent. in Tertullian)) + -idae.
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