Spasm comes from Old French spasme, from Latin spasmus, from Ancient Greek spasmós ('a spasm, convulsion'), from spáein ('to draw, pull'). The historical chain includes Latin spasmus, Ancient Greek spasmós, and Ancient Greek spáein. Older glosses in the chain include "a spasm, convulsion" and "to draw, pull", which help explain the semantic range of the modern word. Morphologically, spasm is best read as borrowing, yielding an English noun shaped by both form history and later usage. In current English it functions as a noun, with the sense "a sudden involuntary contraction of a muscle". English derivatives include spasmic and spasmodic; related forms include spastic and spasmodic. The result is an English noun whose etymology preserves the older forms while supporting the word's specialized modern meaning.