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The Collaborative International Dictionary
onkotomy

oncotomy \on*cot"o*my\ ([o^][ng]"k[o^]t*[-o]*m[y^]), n. [Gr. 'o`gkos bulk, mass + te`mnein to cut: cf. F. oncotomie.] (Surg.) The opening of an abscess, or the removal of a tumor, with a cutting instrument. [Written also onkotomy.]
--Dunglison.