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.
In the United States, the eugenics movement hit its stride in the early 1900s, when increased interest in the genetics of animal breeding coincided with rediscovery of Mendel's 1865 work demonstrating the inheritance patterns of certain characteristics in pea plants.