noun Biology.
the theories of heredity as expounded by Weismann, especially the theory that all inheritable characteristics are carried in the germ plasm, and that acquired characteristics cannot be inherited.

1890–95; Weismann + -ism

Weismannian, adjective, noun
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World English Dictionary
Weismannism (ˈvaɪsmənˌɪzəm)
the doctrine of the continuity of the germ plasm. This theory of heredity states that all inheritable characteristics are transmitted by the reproductive cells and that characteristics acquired during the lifetime of the organism are not inherited
[C19: named after August Weismann (1834--1914), German biologist]

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