Radioactive decay.

(firearms) A pressed metal or plastic link, used to join cartridges for a machine gun. When the cartridge is removed during loading, the link is expelled.

plural of disintegrating link

(pharmacology) A pill designed to disintegrate in the mouth.

(psychiatry) A rare condition characterized by deterioration of language, social function, and motor skills in a child after normal development for the child's first three years.

plural of orally disintegrating tablet