Pennatulae

Pennatula Pen*nat"u*la, n.; pl. L. {Pennatul[ae]}, E. {Pennatulas}. [NL., fr. L. penna a feather.] (Zo["o]l.) 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. [1913 Webster]