Tre‐pan″, v. t. & i. [imp. & p. p.Trepanned (?); p. pr. & vb. n.Trepanning.] [Cf. F. trépaner. See Trepan a saw.] (Surg.) To perforate (the skull) with a trepan, so as to remove a portion of the bone, and thus relieve the brain from pressure or irritation; to perform an operation with the trepan.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.