Dictionary
-tomy
a combining form meaning “cutting, incision” of an organ, “excision” of an object, as specified by the initial element (
appendectomy; lithotomy ); also occurring in abstract nouns corresponding to adjectives ending in
-tomous (
dichotomy ). Cf.
-tome, tomo-, -tomous. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.