nPrehallux(Anat) An extra first toe, or rudiment of a toe, on the preaxial side of the hallux.
Century Dictionary and Cyclopedia
nprehalluxA kind of cartilaginous spur or calcar on the inner side of the foot of some batrachians, next to the hallux, commonly segmented in several pieces. It is inconstant in occurrence, and when present varies much in size, shape, and number of pieces. Its homology is not clear: it has been variously considered as a tarsal element, as a sixth digit, and as a supernumerary element of the foot.
Chambers's Twentieth Century Dictionary
nPrehalluxprē-hal′uks a cartilaginous spur on the inner side of the foot in some batrachians.
Webster's Revised Unabridged Dictionary
NL. See Pre-, and Hallux
The prehallux is large and flat.
"Neotropical Hylid Frogs, Genus Smilisca" by William E. Duellman