蛭石 zhìshí vermiculite Origin Definitions Defs Strokes Stroke Words Sentences Sents 蛭 zhì leech (bound form) leech; fluke; any of various parasitic segmented worms of the class Hirudinea, such as the 水蛭 shuǐzhì石 shí noun stone rock; stone; (bound form) made of stone; rock-like