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delta ray any particle emitted from matter following bombardment by ionizing radiation.
delta wave a low-frequency electric brain wave present during deep sleep in normal adults; delta rhythm.
delta wing the triangular wing of certain usu. supersonic aircraft, which provides not only lift but also horizontal stabilization.
Mekong Delta an expansive delta region formed by the Mekong River in southeast Vietnam, whose wetlands make it a major rice producer. The Mekong Delta was a scene of heavy combat between U.S. and Viet Cong troops during the Viet Nam War.