myotonoid

Denoting a muscular reaction, naturally or electrically excited, characterized by slow contraction and, especially, slow relaxation. [myo- + G. tonos, tone, tension, + eidos, resemblance]

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my·ot·o·noid (mi-otґə-noid) [myo- + ton- + -oid] resembling myotonia; said of reactions in muscle which are marked by slow contraction or relaxation.