A person or thing that has no equal; a paragon.
A small, flat chocolate drop covered with such pellets of sugar, similar to a comfit.
The blue underwing or Clifden nonpareil (Catocala fraxini), a species of moth distributed across the Palearctic; also (obsolete) any of a number of moths of other species.
A caper (“pickled edible flower bud”) of the smallest size.
The painted bunting (Passerina ciris), a brightly-coloured finch native to North America.
The size of type between ruby and emerald (or, in the United States, between agate and minion), standardized as 6-point; (countable) a slug of this size.
Unequalled, unrivalled; unique.
A person or thing whose nature or value is a mystery.
Used other than figuratively or idiomatically: see unknown, quantity.