‖Pen‐nat″u‐la (?), n.; pl. L. Pennatulæ (#), E. Pennatulas (#). [NL., fr. L. penna a feather.] (Zoöl.) Any one of numerous species of Pennatula, Pteroides, and allied genera of Alcyonaria, having a featherlike form; a sea-pen. The zooids are situated along one edge of the side branches.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.