Definition of prepollex in US English:

prepollex

noun

Zoology
  • A rudimentary digit found on the inner side of the hand or manus of some mammals, reptiles, and amphibians.

Origin

Late 19th century; earliest use found in The Athenaeum. From German Praepollex from classical Latin prae- + pollex.

Pronunciation

prepollex

/priːˈpɒlɛks/