1trea·sure 
/ˈtrɛʒɚ/ noun
plural trea·sures /ˈtrɛʒɚ/ noun 1 [noncount] : something valuable (such as money, jewels, gold, or silver) that is hidden or kept in a safe place
▪ a legend about the pirates' buried/sunken/hidden treasure ▪ the royal treasure 2 [count] : something that is very special, important, or valuable
▪ childhood treasures [=things that are important to you because you had them when you were a child] ▪ Central Park is one of New York City's many treasures. ▪ The panda is considered one of China's national treasures. [=something that is greatly valued by the people of China] 3 [singular] : a person who is greatly loved or valued especially because of being very helpful
▪ Grandmother's nurse has been a real treasure.
▪ a legend about the pirates' buried/sunken/hidden treasure ▪ the royal treasure
▪ childhood treasures [=things that are important to you because you had them when you were a child] ▪ Central Park is one of New York City's many treasures. ▪ The panda is considered one of China's national treasures. [=something that is greatly valued by the people of China]
▪ Grandmother's nurse has been a real treasure.
