commissurotomy
noun
com·mis·sur·ot·o·my
| \ ˌkäm-ə-ˌshu̇(ə)r-ˈät-ə-mē, -shə-ˈrät-
\
\
plural commissurotomies
Medical Definition of commissurotomy
: the operation of cutting through a band of muscle or nerve fibers
specifically
: separation of the flaps of a mitral valve to relieve mitral stenosis : valvulotomy