(obsolete) An extract from the glands of a beaver, reputed to have medicinal value. / (obsolete) A plant (probably the castor bean), or a preparation from this plant, reputed to have medicinal value.

plural of quaich

(biology) the study of plants; botany

A certain vaptan drug proposed for the treatment of hyponatremia, particularly in patients with conditions such as liver cirrhosis or congestive heart failure.