n. A tissue, in the leaves of many plants, that contains microscopic pores through which water is excreted.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a pore that exudes water on the surface or margin of a leaf of higher plants
Word Usage
"Even if the hydathode is treated with sublimate solution, all the conditions for mechanical filtration still remain: the earth has moisture which can be taken up by the roots so that root-pressure still exists."