Any spaces or cavities within a cell. They may function in digestion, storage, secretion, or excretion. ... (12 Dec 1998) ... 
(Life processes and cells) a space within the cytoplasm of plant cells that contains cell sap
vacuoles Any spaces or cavities within a cell. They may function in digestion, storage, secretion, or excretion.
Spaces left by materials in a magma that are easily vaporised, such as water and carbon dioxide.