1º_ Loss of one or more sounds at the beginning of a word, as a linguistic resource or by the evolution of the language itself. It has Greek origin in the verb 945; 966; 945; 953; 961; 949; 953; 957; (aphairein "subtract, subtract") . 2º_ In biochemistry it is the separation and extraction of some component in a substance. It is especially used in hemotherapy.
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