Core
Middle English: of unknown origin.
wiktionary
From Middle English core, kore, coor(“apple-core, pith”), of uncertain origin. Possibly of native English origin (compare Old English corn(“seed", also "grain”), or perhaps from Old French cuer(“heart”), from Latin cor(“heart”); or from Old French cors(“body”), from Latin corpus(“body”). Compare also Middle English colk, coke, coll(“the heart or centre of an apple or onion, core”), Dutch kern(“core”), German Kern(“core”). See also heart, corpse.
See corps
See chore
From Hebrew כֹּר
Possibly an acronym for cash on return
etymonline
core (n.)
early 14c., "heart or inmost part of anything" (especially an apple, pear, etc.), of uncertain origin, probably from Old French cor, coeur "core of fruit, heart of lettuce," literally "heart," from Latin cor "heart," from PIE root *kerd- "heart."
Meaning "a central portion cut and removed" (as from a tree, soil, etc.) is from 1640s. Meaning "internal mold of a casting, which fills the space intended to be left hollow" is from 1730. Nuclear physics sense "portion of a reactor containing the nuclear fuel and where the reactions take place" is from 1949.
core (v.)
"to remove the core of" (a fruit), mid-15c., from core (n.). Related: Cored; coring.
