volutin

vo·lu·tin

noun \ˈväl-yə-ˌtin, və-ˈlüt-^ən\

Definition of VOLUTIN

: a granular basophilic substance containing nucleic acids that is found especially in cells of microorganisms (as bacteria, yeast, and protozoans) and is believed to function as a phosphate reserve—called also metachromatin