early 15c., "hands and feet, uttermost parts of the body," plural of extremity. Meaning "a person's last moments" is from c. 1600.
Entries linking to extremities
extremity n.
late 14c., "one of two things at the extreme ends of a scale," from Old French estremite (13c.), from Latin extremitatem (nominative extremitas) "the end of a thing," from extremus "outermost;" see extreme (adj.), the etymological sense of which is better preserved in this word. Meaning "utmost point or end" is from c. 1400; meaning "limb or organ of locomotion, appendage" is from early 15c. (compare extremities). Meaning "highest degree" of anything is early 15c. Related: Extremital.