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From: Webster's Revised Unabridged Dictionary (1913)

 Pen·nat·u·la n.; pl. L. Pennatulæ E. Pennatulas   Zool. 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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