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.
Definition: Isomeric transition is a form of radioactive decay where a gamma photon is emitted by a nucleus in an excited metastable state. The photon is emitted when the energy of the excited nucleus drops to the lower, ground state.