Also found in: Dictionary, Thesaurus, Encyclopedia.
Related to Lamarck theory: Malthus theory
[Jean Baptiste P. A. Lamarck, Fr. naturalist, 1744–1829]
A theory proposed in the 19th century, now rejected, that characteristics acquired by use or disuse can become inherited and passed to offspring.See: natural selection
Medical Dictionary, © 2009 Farlex and Partners