brontea

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.

brontĕa, ae, f. [βροντή],

the thunderstone , a precious stone , Plin. 37, 10, 55, § 150. —Also called brontia , Isid. Orig. 16, 15, 24 (MSS. bronia ).