Answer: pyrene

AnswerCrossword Clue
PYRENEA peach stone, botanically speaking.
PYRENESeed of pears, apples, etc.
PYRENESeed or stone of a fruit.
PYRENEFruit stone.
pyreneputamen or stone, esp. when there are several in a single fruit; nutlet
pyrenepolycyclic, aromatic crystalline hydrocarbon, C16H10, consisting of four fused benzene rings, found in coal tar and believed to be carcinogenic
pyrenethe hard covering of the kernel of certain fruits, also PUTAMEN