clover
noun /ˈkləʊvə(r)/
  /ˈkləʊvər/
 [uncountable]Idioms - a small wild plant that usually has three leaves on each stem and purple, pink or white flowers that are like balls in shape
- a four-leaf clover (= one with four leaves instead of three, thought to bring good luck)
 
Word OriginOld English clāfre, of Germanic origin; related to Dutch klaver and German Klee. 
Idioms 
be/live in clover 
- (informal) to have enough money to be able to live a very comfortable life