terminal (adj) – appearing at or signaling the end of something; incurable; fatal
BREAKDOWN: TERMIN- (end) + -AL (pertaining to)
— a terminal can also be a point in an electronics or telecommunications array or a ground transportation hub where service begins and ends
— a terminus is an ending or final point or specifically the end point of a transportation system
This word is built on the root TERM-, which means end, limit, or border.
Common TERM- words include determine, determined, exterminate, term, and terminology.
More esoteric TERM- words include determinative, deterministic, predetermine, and terminus.