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Speciation, the formation of new and distinct species in the course of evolution. Speciation involves the splitting of a single evolutionary lineage into two or more genetically independent lineages.
excoriation. Definitions: 1. A scratch mark; a linear break in the skin surface, usually covered with blood or serous crusts. The definition information for excoriation is provided by Stedman's. You can search our medical dictionary here.he definition information for excoriation is provided by Stedman's. You can search our medical dictionary here.