colon (n.1) Look up colon at
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) Look up colon at
"large intestine," late 14c., from Latinized form of Greek kolon (with a short initial -o-) "large intestine," which is of unknown origin.