[tris.mus] n [NL, fr. Gk trismos gnashing (of teeth), fr. trizein to squeak, gnash; akin to L stridere to creak--more at strident] (ca. 1693): spasm of the muscles of mastication: lockjaw
TRISMUS
Meaning of TRISMUS in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012