the.com/jade

means A green ornamental stone (actually one of two minerals, jadeite or nephrite) prized for carving and jewelry — and, as a verb, to make weary or dull through overuse, as in a 'jaded' palate.

from From Spanish 'piedra de ijada,' literally 'stone of the flank,' because the conquistadors saw the indigenous peoples of the Americas using it as a folk remedy for ailments of the kidneys and side. The phrase wore down to French 'le jade' and then into English. The wholly separate 'jaded' comes from an older English 'jade' meaning a worn-out, broken-down horse — origin unknown — from which the sense of tiredness was saddled onto people and, later, onto appetites.