pyrene 1
/puy"reen, puy reen"/ , n. Bot.
a putamen or stone, esp. when there are several in a single fruit; a nutlet.
[ 1830-40; pyrena pyrén fruit stone ]
pyrene 2
/puy"reen/ , n. Chem.
a polycyclic, aromatic crystalline hydrocarbon, C 16 H 10 , consisting of four fused benzene rings, found in coal tar and believed to be carcinogenic.
[ 1880-85; PYR- + -ENE ]