n.
    - a pale yellow oval citrus fruit with thick skin and fragrant, acidic juice. 
▸a drink made from or flavoured with lemon juice.
 - the evergreen citrus tree which produces lemons. 
[Citrus limon.]
 - a pale yellow colour.
 - informal an unsatisfactory person or thing.
 
 
  Derivative
  
  Etymology
  ME: via OFr. limon from Arab. līmūn; cf. lime2.