py•renePronunciation: (pī'rēn, pī-rēn'), [key]
a putamen or stone, esp. when there are several in a single fruit; a nutlet.
py•renePronunciation: (pī'rēn), [key]
a polycyclic, aromatic crystalline hydrocarbon, C16
, consisting of four fused benzene rings, found in coal tar and believed to be carcinogenic.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.