My″o‐tome (?), n. [See Myotomy.] (Anat.) (a) A muscular segment; one of the zones into which the muscles of the trunk, especially in fishes, are divided; a myocomma. (b) One of the embryonic muscular segments arising from the protovertebræ; also, one of the protovertebræ themselves. (c) The muscular system of one metamere of an articulate.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.