Dictionary
pre•pol•lex
Pronunciation: (pri-pol'eks), [key]—
n.,
—pl. -pol•li•cesPronunciation: (-pol'u-sēz"). [key]
a rudimentary additional digit on the preaxial side of the thumb of certain amphibians and mammals.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.