colon (n.1)

punctuation mark, 1540s, from Latin colon "part of a poem," from Greek kolon (with a long initial -o-) "part of a verse," literally "limb, member" (especially the leg, but also of a tree limb), also, figuratively, "a clause of a sentence," from PIE root *(s)kel- (3) "bent, crooked" (see scoliosis). Meaning evolved from "independent clause" to punctuation mark that sets it off.

colon (n.2)

"large intestine," late 14c., from Latinized form of Greek kolon (with a short initial -o-) "large intestine," which is of unknown origin.

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