tick trefoil 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 a genus (Desmodium) of leguminous plants with clusters of small purple flowers, leaves in groups of three, and jointed prickly pods
tick trefoil definition by American Heritage Dictionary
Any of various plants of the genus Desmodium, usually having trifoliolate compound leaves, racemes of small purplish or white flowers, and jointed seedpods with easily separable, one-seeded segments.
Origin: From tick2 (from the way its pods adhere to animals).