Re‐tract″or (–ẽr), n. One who, or that which, retracts. Specifically: (a) In breech-loading firearms, a device for withdrawing a cartridge shell from the barrel. (b) (Surg.) An instrument for holding apart the edges of a wound during amputation. (c) (Surg.) A bandage to protect the soft parts from injury by the saw during amputation. (d) (Anat. & Zoöl.) A muscle serving to draw in any organ or part. See Illust. under Phylactolæmata.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.