Grandmother
来自Big Physics
wiktionary
From Middle English graundmodre, grauntmoder, granmoder; equivalent to grand- + mother. Compare French grand-mère. Superseded earlier eldmother, eldermother.
etymonline
grandmother (n.)
early 15c., from grand- + mother (n.1), probably on analogy of French grand-mère. Replaced earlier grandame (c. 1200) and Old English ealdemodor.
