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.
Eugenics movement. Significance: The eugenics movement had a significant influence on U.S. immigration policy. Politicians, reformers, and civic leaders imbued with a sense of Americanism and scientific justification enacted laws to limit immigration to what they regarded as âdesirableâ types.