1555, "goal, end, final point," from L. terminus (pl. termini) "end, boundary line," from PIE base *ter-, base of words meaning "peg, post, boundary, marker goal" (cf. Skt. tarati "passes over, crosses over," Hittite tarmaizzi "he limits," Gk. terma "boundary, end, limit"). In ancient Rome, Terminus was the name of the deity who presided over boundaries and landmarks, focus of the important Roman festival of Terminalia (held Feb. 23, the end of the old Roman year). Meaning "either end of a transportation line" is first recorded 1836.
Merriam-Webster's Medical Dictionary - Cite This Source - Share This Main Entry: ter·mi·nus Pronunciation: 't&r-m&-n&s Function: noun Inflected Form: pluralter·mi·ni/-"nI,-"nE/alsoter·mi·nus·es : an end or ending especially of a molecular chain, a chromosome, or a process of a nerve cell
Ter"mi*nal\, n. (Railroads) (a) The end of a line of railroad, with the switches, stations, sheds, and other appliances pertaining thereto. (b) Any station for the delivery or receipt of freight lying too far from the main line to be served by mere sidings. (c) A rate charged on all freight, independent of the distance, and supposed to cover the expenses of station service, as distinct from mileage rate, generally proportionate to the distance and intended to cover movement expenses; a terminal charge. (d) A town lying at the end of a railroad; -- more properly called a terminus.