Louis Leakey louis·lea·key uncommon noun 1. English paleontologist whose account of fossil discoveries in Tanzania changed theories of human evolution (1903-1972) SynonymsLeakeyLouis LeakeyLouis Seymour Bazett Leakey Related words Broader terms paleontologistanthropologist WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.