keratoma

noun
ker·a·to·ma | \ˌker-ə-ˈtō-mə \
plural keratomas also keratomata\-mət-ə \

Medical Definition of keratoma 

1 : a hard thickened area of skin produced by hypertrophy of the horny layers : callus

2 : a tumorlike growth of horny tissue on the inner surface of the wall of a horse's hoof

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