One of the mysteries of the English language finally explained.
1The procedure of widening the orifice of a valve of the heart, especially the mitral valve, originally by incisions made at the commissures of the orifice and later also by other techniques; an instance of this.
2The procedure of incising or dividing a commissure of the nervous system; an instance of this.
1940s. From commissure + -o- + -tomy.
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