prepollex

American  

[pri-pol-eks] / prɪˈpɒl ɛks /

noun

PLURAL

prepollices

1. a rudimentary additional digit on the preaxial side of the thumb of certain amphibians and mammals.

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Etymology

Origin of prepollex

From New Latin, dating back to 1885–90; pre-, pollex

Example Sentences

Some glassfrogs have the additional structure present in various anuran hands known as the prepollex, sometimes called the pseudothumb.

From Scientific American

There’s been substantial interest in the idea that the prepollex might represent the true digit I – if so, this would mean that at least some anurans still have five digits.

From Scientific American

Recent embryological studies seem to show that this isn’t the case, and that the prepollex is a wholly novel structure.

From Scientific American

A survey of prepollex and prehallux variation in anuran limbs.

From Scientific American

Note the variation in prepollex form, as well as the T-shaped terminal phalanges and the distinctive flange on metacarpal III.

From Scientific American