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From The Collaborative International Dictionary of English v.0.48:
Weismannism \Weis"mann*ism\, n. (Biol.) The theories and teachings in regard to heredity propounded by the German biologist August Weismann, esp. in regard to germ plasm as the basis of heredity and the impossibility of transmitting acquired characteristics; -- often called neo-Darwinism. [Webster 1913 Suppl.]