Real Dictionary

jade
colour: Something that is jade or jade green is bright green in colour.
uncountable noun: Jade is a hard stone, usually green in colour, that is used for making jewellery and ornaments.

jade in American English 1
any of various hard greenish gems used in jewelry and artistic carvings, including jadeite and nephrite
made of jade
noun: either of two minerals, jadeite or nephrite, sometimes green, highly esteemed as an ornamental stone for carvings, jewelry, etc

jade in American English 2
a horse, esp. a worn-out, worthless one
to make or become dull, worn-out, or weary, as from overwork or overuse
to make or become tired, weary, or worn-out
noun: a worn-out, broken-down, worthless, or vicious horse

jade in British English 1
noun: a semiprecious stone consisting of either jadeite or nephrite. It varies in colour from white to green and is used for making ornaments and jewellery

jade in British English 2
noun: an old overworked horse; nag; hack
verb: to exhaust or make exhausted from work or use