(of a motion) in the direction of contraction of a muscle. (E.g. extension of the lower arm via the elbow joint while contracting the triceps and other elbow extensor muscles; closing of the jaw while flexing the masseter).
From Middle English concentrik, from Middle French concentrique, from Medieval Latin concentricus, from Latin con- ("with, together") + centrum. Equivalent to con- + -centric.
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