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.
social issues. The specter of eugenics hovers over virtually all contemporary developments in human. Eugenics was rooted in the social Darwinism of the late 19th century, a period in which notions of fitness, competition, and biological rationalizations of inequality were popular. At the time, a growing number of theorists introduced Darwinian analogies of  survival of the fittest  into social argument.