A green aphid on a rose petal.
aphis 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.
noun pl. aphides
an aphid; specif., one of a widespread genus (Aphis)
Origin: Modern Latin
aphis definition by American Heritage Dictionary
noun pl. a·phi·des
An aphid, especially one of the genus Aphis.
Origin: New Latin Aphis, genus name.