A medical treatment or substance that opposes or prevents trismus (severe jaw clenching or lockjaw).
From anti- (against) + trismus, from Greek trizein (to grit one's teeth). The term is rare and mostly historical, appearing in older medical texts from the 1800s.
Trismus can be caused by tetanus (lockjaw), radiation therapy, or even extreme stress—and while we now understand it better, doctors in earlier centuries had almost no effective antitrismus treatments available.
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