Is it farther or further?
polyunsaturated pol·y·un·sat·u·rat·ed (pŏl'ē-ŭn-sāch'ə-rā'tĭd)
Of or relating to long-chain carbon compounds, especially fats, having many unsaturated bonds.
Relating to an organic compound, especially a fat, in which more than one pair of carbon atoms are joined by double or triple bonds. See more at unsaturated.