The Collaborative International Dictionary of English v.0.48:

Grape fruit \Grape" fruit`\
   The shaddock.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pomelo \Pom"e*lo\, n. [Cf. Pompelmous.]
   A variety of shaddock, called also grape fruit.
   [1913 Webster]