Bible Dictionaries
Lamarckism
Webster's Dictionary
(n.) 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.
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Bibliography Information
Webster, Noah. Entry for 'Lamarckism'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/l/lamarckism.html. 1828.