n. [ From Lamarck, a distinguished French naturalist. ] (Biol.) The theory that structural variations, characteristic of species and genera, are produced in animals and plants by the direct influence of physical environments, and esp., in the case of animals, by effort, or by use or disuse of certain organs. It is a discredited theory, not believed by modern biologists. [ 1913 Webster +PJC ]
[ようふようせつ, youfuyousetsu] (n) (See ラマルク説) Lamarckian evolutionary theory in which individuals lose characteristics that are not used and develop characteristics that are often used [Add to Longdo]
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