Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
any of several anthozoans with the skeleton branched into a featherlike form, as the sea pen
Used by arrangement with John Wiley & Sons, Inc.
nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Any of several anthozoans of the family Pennatulidae, having a featherlike shape formed by an elongate shaft with paired lateral pinnules.