Causing a growth of cells that produce keratin and result in the formation of horny tissue, such as fingernails, scales, feathers, etc.
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ker·a·tog·e·nous .ker-ə-'täj-ə-nəs adj producing horn or horny tissue
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ker·a·tog·e·nous (ker″ə-tojґə-nəs) [kerato- + -genous] giving rise to a growth of horny material.Medical dictionary. 2011.