"A small room or cell. Now rare", Late Middle English; earliest use found in Lanfranc's Science of Cirurgie. From Middle French, French cellule extremely small enclosed space, cavity, or sac in an organized body or product, compartment in the brain, small room or cell and its etymon classical Latin cellula small room or cell, in post-classical Latin also compartment in the brain from cella + -ula; compare -ule.[cellule etymology, cellule origin, 英语词源]