Sentence:  <WSD>POMELO</WSD> (syn. grape fruit).&mdash;A variety of shaddock; fruit very large, from two to five pounds each, pale yellow, resembling the citron; skin smooth; pulp sub-acid. / SHADDOCK.&mdash;Tree inclined to be dwarf; fruit very large, with smooth skin, pale yellow and very glossy; the rind is very thick and spongy, and very bitter; ornamental only 
Meaning of the word marked with <WSD> tags:  the grapefruit.