Webster's English Dictionary

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citrus

cit.rus \'si-tr*s\ n or citrus or cit.rus.es [NL, genus name, fr. L, citron 
   tree] pl  often attrib  : any of a genus (Citrus) of often thorny trees and 
   shrubs of the ru e family grown in warm regions for their large fruit (as 
   the orange) with firm usu. thick rind and pulpy flesh