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: A pseudoscience with the stated aim of improving the genetic constitution of the human species by selective breeding. Eugenics is from a Greek word meaning 'normal genes.' The use of Albert Einstein's sperm to conceive a child by artificial insemination would represent an attempt at positive eugenics. The Nazis notoriously engaged in negative eugenics by genocide in world war II.