The Collaborative International Dictionary
Prehallux
Prehallux \Pre*hal"lux\, n. [NL. See Pre-, and Hallux.] (Anat.) An extra first toe, or rudiment of a toe, on the preaxial side of the hallux.
Wiktionary
prehallux
n. (context anatomy English) An extra first toe, or rudiment of a toe, on the preaxial side of the hallux.