hairy cell leukemia a form of chronic leukemia marked by splenomegaly and by an abundance of abnormal large mononuclear cells covered by hairlike villi (hairy cells) in the bone marrow, spleen, liver, and peripheral blood.
A set of orbitals are said to be degenerate if they all have the same energy. This degeneracy can sometimes be lifted by external electric or magnetic fields.
radioactive decay-the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation. disintegration, decay. alpha decay-radioactive decay of an atomic nucleus that is accompanied by the emission of an alpha particle.