A theory of organic evolution claiming that acquired characteristics are transmitted to offspring WordNet 3.0 & Open English WordNet

Lamarckism, also known as Lamarckian inheritance or neo-Lamarckism, is the notion that an organism can pass on to its offspring physical characteristics that the parent organism acquired through use or disuse during its lifetime. Wikipedia

Hypothesis that an organism can pass on characteristics that it has acquired through use or disuse during its lifetime to its offspring Wikidata

The theory that structural variations, characteristic of species and genera, are produced in animals and plants by the direct influence of physical environments, and especially, in the case of animals, by effort, or by use or disuse of certain organs. OmegaWiki

Theory. Wiktionary (translation)