core
n.
late 14c., probably from Old French coeur "core of fruit, heart of lettuce," literally "heart," from Latin cor "heart," from PIE root *kerd- "heart" (see heart). Nuclear reactor sense is from 1949.
v.
mid-15c., from core, n.. Related: Cored; coring.
〔蒋〕[cor=cord心] 核心