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Meaning of commissurotomy

com•mis•sur•ot•o•my

Pronunciation: (kom"u-shu-rot'u-mē), [key]
— pl. -mies.
  1. the incision of a band of commissures, esp. of mitral fibers, to correct mitral stenosis. Cf. valvulotomy.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.