Sentence:  <WSD>Pomelo</WSD>. — Much larger than an orange and smaller than a shaddock; a delicious fruit, preferred by many to the orange. Skin smooth, pale yellow; subacid. The membrane dividing the pulp is bitter, and must be removed before eating the pulp. Also called "grape-fruit" from its habit of growing in clusters. 
Meaning of the word marked with <WSD> tags:  the grapefruit.