pomelo

[pom-uh-loh] /ˈpɒm əˌloʊ/
noun, plural pomelos.
1.
the very large, yellow or orange citrus fruit of a tree, Citrus maxima, of southeastern Asia.
2.
the tree itself.
Also called shaddock.
Origin
1855-60; pseudo-Spanish alteration of pomplemoose < Dutch pompelmoes, perhaps blend of pompoen pumpkin and Portuguese limões, plural of limão lemon
British Dictionary definitions for pomelo

pomelo

/ˈpɒmɪˌləʊ/
noun (pl) -los
1.
a tropical rutaceous tree, Citrus maxima (or C. decumana), grown widely in oriental regions for its large yellow grapefruit-like edible fruit
2.
the fruit of this tree
3.
(mainly US) another name for grapefruit
Also called shaddock
Word Origin
C19: from Dutch pompelmoes, perhaps from pompoen big + Portuguese limão a lemon