Bichat, Marie François Xavier (märēˈ fräNswäˈ zävyāˈ bēshäˈ) [key], 1771–1802, French anatomist and physiologist. He studied the tissues, giving them that name and classifying them into 21 types; this work was the basis of modern histology. He wrote Traité des membranes (1800), Recherches physiologiques sur la vie et sur la mort (1800), Traité d'anatomie descriptive (1801–3, in 5 vol.), and Anatomie générale (1801).
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