“forefathers” is a form of
forefather
UK /ˈfɔːˌfɑːðə/ · US /ˈfɔɹˌfɑːðɚ/ noun
Forms forefathers
Synonyms
Etymology
From Middle English forefader, forfader, vorvader, from Old English forefæder (“forefather”), but possibly also merged with Old Norse forfaðir. Equivalent to fore- + father. Compare Dutch voorvader (“forefather”), German Vorvater, Vorfahr (“forefather”), Danish forfader (“forefather”), Swedish förfader (“forefather”).
Webster’s 1913
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “forefather”, CC BY-SA 4.0. Details