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.
Meanings and types of eugenics. The word eugenics etymologically derives from the Greek words eu (good) and gen (birth), and was coined by Francis Galton in 1883. Eugenics has, from the very beginning, meant many different things to many different people.