Emily Dickinson Lexicon

DI-PYRE', n.

A mineral occurring in minute prisms, either single or adhering to each other in fascicular groups. Before the blowpipe, it melts with ebullition or intumescence, and its powder on hot coals phosphoresces with a feeble light. Its name, from Gr. δυο, two, and πυρ, fire, indicates the double effect of fire, in producing fusion and phosphorescence. – Cleaveland.