Emily Dickinson Lexicon

ROUND'EL, or ROUND'E-LAY, n. [or ROUND'O. Fr. rondelet, from rond, round.]

1. A sort of ancient poem, consisting of thirteen verses, of which eight are in one kind of rhyme, and five in another. It is divided into couplets; at the end of the second and third of which, the beginning of the poem is repeated, and that, if possible, in an equivocal or punning sense. Trevoux. Encyc.
2. [Fr. rondelle, a little shield.] A round form or figure. [Not used.] Bacon.
3. [Roundel, in heraldry, a circular spot. – E.H.B.]