Vacuole (thing)

1. a large, fluid-filled compartment in the cytoplasm of a plant cell, or
2. a smaller vesicle (a compartment that can involve cellular secretion, storage or nutrient uptake) in the cytoplasm of any eukaryotic cell

From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.