Freebase(0.00 / 0 votes)Rate this definition: Tongue. The tongue is a muscular hydrostat on the floors of the mouths of most vertebrates which manipulates food for mastication. It is the primary organ of taste, as much of the upper surface of the tongue is covered in papillae and taste buds.
1. eugenics-the study of methods of improving genetic qualities by selective breeding (especially as applied to human mating). bioscience, life science-any of the branches of natural science dealing with the structure and behavior of living organisms.
Drawing on social Darwinism, supporters of the 20th-century eugenics movement sought to improve human genetic stock, much as farmers do in agriculture. This essay examines the history of eugenics and considers modern genetic research in the same light, so that the lessons of history are not forgotten.