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.