I. ˈpīˌrēn, ̷ ̷ˈ ̷ ̷ noun
( -s )
Etymology: New Latin pyrena
: the stone of a drupelet (as in the fruit of the huckleberry) ; broadly : a small hard nutlet
II. ˈpīˌrēn noun
( -s )
Etymology: pyr- + -ene
: a pale yellow crystalline hydrocarbon C 16 H 10 that fluoresces blue in solution, that is obtained from coal-tar distillation, from petroleum cracking, and from stupp and is also made synthetically, and that consists structurally of a cluster of four compactly fused benzene rings