1. : the liquid content of the vacuole of a plant cell consisting of an aqueous solution of organic acids and their salts as well as pigments, proteins, tannins, emulsified fats, and other complex compounds chiefly in the colloidal state
2. : the more fluid part of protoplasm : karyolymph, hyaloplasm
* * *
the watery fluid within the central vacuole of a plant cell.
[1885-90]
Useful english dictionary. 2012.