On‐cot″o‐my (ŏṉ″kŏt‐ō̍‐my̆), n. [Gr. ὄγκοσ bulk, mass + τέμνειν 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.