Pyrene \Py"rene\, n. [Gr. ? fire.] (Chem.)
   One of the less volatile hydrocarbons of coal tar, obtained
   as a white crystalline substance, C16H10.
   [1913 Webster]

	

	Pyrene \Py"rene\, n. (Bot.)
   Same as Pyrena.
   [1913 Webster]

	

	pyrene
    n 1: a pale yellow crystalline hydrocarbon C16H10 extracted from
         coal tar
    2: the small hard nutlet of a drupe or drupelet; the seed and
       the hard endocarp that surrounds it