athermosystaltic

Not contracted or constricted by ordinary variations of temperature; said of certain tissues. [G. a- priv. + thermos, hot, + systaltikos, constringent]

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ather·mo·sys·tal·tic (ə-thur″mo-sis-talґtik) [a-¹ + thermo- + systaltic] not contracting under the action of cold or heat; said of skeletal muscle.