"fish-eating, habitually feeding upon fish," 1660s, from Latin piscis "a fish" (from PIE root *pisk- "a fish") + -vorous "eating, devouring."
Entries linking to piscivorous
*pisk-
Proto-Indo-European root meaning "a fish."
It forms all or part of: fish; fishnet; grampus; piscatory; Pisces; piscine; porpoise.
It is the hypothetical source of/evidence for its existence is provided by: Latin piscis (source of Italian pesce, French poisson, Spanish pez, Welsh pysgodyn, Breton pesk); Old Irish iasc; Old English fisc, Old Norse fiskr, Gothic fisks.
-vorous
word-forming element meaning "eating," from Latin -vorous, from stem of vorare "to devour" (from PIE root *gwora- "food, devouring").