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.
California passes a eugenics law and is the second state in the Union following Indiana to pass a sterilization law. The state's law is considered one of the most severe. Those considered feeble-minded, prisoners displaying sexuality, and persons convicted of three crimes were forcefully sterilized.