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.
Darwin s theories played an important role in the American s usage of eugenics and in the justification of racial and sexist separateness. Eugenics, the study of human heredity, aimed at improving the human race, proved to be one of the most enduring aspects of Social Darwinism.ocial Darwinism in American History Toward the end of the 19th century, the United States entered a period of growth and industrialisation. An abundance of natural recourses, cheap labour supply, ...