grapefruit vs limetta

grapefruit

noun
  • The tree of the species Citrus paradisi, a hybrid of pomelo (Citrus maxima) and sweet orange. 

  • The large spherical tart fruit produced by this tree. 

limetta

noun
  • Citrus limetta, a small, round, sweet citrus fruit, a cross between the citron and bitter orange. 

How often have the words grapefruit and limetta occurred in a corpus of books? (source: Google Ngram Viewer )