songhai: a Nilo-Saharan language spoken by the Songhai in Mali and Niger
nilo-saharan: a family of East African languages spoken by Nilotic peoples from the Sahara south to Kenya and Tanzania
quantum chromodynamics: a theory of strong interactions between elementary particles (including the interaction that binds protons and neutrons in the nucleus); it assumes that strongly interacting particles (hadrons) are made of quarks and that gluons bind the quarks together