1. Something of unequaled excellence; a peerless thing or person; a nonesuch; often used as a name.
2. [F. Nonpareille.
3. (Science: zoology) A beautifully coloured finch (Passerina ciris), native of the southern united states. The male has the head and neck deep blue, rump and under parts bright red, back and wings golden green, and the tail bluish purple. Called also painted finch. Any other similar bird of the same genus.