citron melon

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cit′ron mel`on

a round hard-fleshed watermelon, Citrullus lanatus citroides, used candied or pickled.
[1800–10, Amer.]
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References in classic literature ?
The fruit somewhat resembles in magnitude and general appearance one of our citron melons of ordinary size; but, unlike the citron, it has no sectional lines drawn along the outside.