Lamarckism
Pronunciation : La"marck"ism
Part of Speech : n.
Etymology : [From Lamarck, a distinguished French naturalist.] (Biol.)
Definition : Defn: 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.
Source : Webster's Unabridged Dictionary, 1913
Merriam-Webster's Everyday Language Reference Set: Includes: The Merriam-Webster Dictionary, The Merriam-Webster Thesaurus, and The Merriam-Webster Vocabulary Builder