We found one dictionary that defines the word grandancestor:

General (1 matching dictionary)

1. grandancestor: Wiktionary

Definitions from Wiktionary (grandancestor) ▸ noun:  (rare) A distant ancestor. ▸ Words similar to grandancestor ▸ Usage examples for grandancestor ▸ Idioms related to grandancestor ▸ Wikipedia articles (New!) ▸ Popular adjectives describing grandancestor ▸ Words that often appear near grandancestor ▸ Rhymes of grandancestor ▸ Invented words related to grandancestor