• (n.) A variety of chalcedony containing water.
En·hy'dros noun [ New Latin See Enhydrous .] (Min.) A variety of chalcedony containing water. 
enhydros A variety of chalcedony containing water. Chalcedony; calcedony: A translucent to transparent milky or grayish quartz with distinctive microscopic crystals arranged in slender fibers in parallel bands.