Entry 2 senses · 2 variants Webster, 1913 Prepollent · Pre·pol·lent · IPA a. n. 01 a. Having superior influence or power; prevailing; predominant. 1. Having superior influence or power; prevailing; predominant.[R.] 02 n. An extra first digit, or rudiment of a digit, on the preaxial side of the pollex. pl. Prepollices ((#)) 1. An extra first digit, or rudiment of a digit, on the preaxial side of the pollex.(Anat.)