‖Per′i‐my″si‐um (?), n. [NL., fr. Gr. περί about + μυ̑σ muscle.] (Anat.) The connective tissue sheath which surrounds a muscle, and sends partitions inwards between the bundles of muscular fibers.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.