Adam's needle definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
any of several species (esp. Yucca filamentosa) of the yucca plant
Adam's needle definition by American Heritage Dictionary
Any of several closely related, stemless or nearly stemless plants of the genus Yucca, especially Y. filamentosa and Y. smalliana of the southeast United States, having long thin leaves and clusters of fragrant, white or off-white flowers.
Origin: From the spines on its leaves.