- a rudimentary additional digit on the preaxial side of the thumb of certain amphibians and mammals.
Origin of prepollex
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for prepollex
Breeding males have dark brown nuptial excrescences on the prepollex.Neotropical Hylid Frogs, Genus Smilisca
William E. Duellman
The digits (and metacarpals) are considered by Ritland to be 1-4, in addition to the prepollex, rather than 2-5.The Ancestry of Modern Amphibia: A Review of the Evidence
Theodore H. Eaton