Emily Dickinson Lexicon

MEL-O-CO-TONE, n. [Sp. melocoton, a peach-tree grafted into a quince-tree, or the fruit of the tree; It. melocotogno, quince-tree; L. malum cotoneum, quince-apple. Cotoneum is probably our cotton, and the fruit so named from its pubescence.]

A quince. But the name is sometimes given to a large kind of peach.