Definition of "Pyrene" :
noun: the small hard nutlet of a drupe or drupelet; the seed and the hard endocarp that surrounds it
noun: a pale yellow crystalline hydrocarbon C16H10 extracted from coal tar
noun: the small hard nutlet of a drupe or drupelet; the seed and the hard endocarp that surrounds it
noun: a pale yellow crystalline hydrocarbon C16H10 extracted from coal tar