Source : Webster's Revised Unabridged Dictionary (1913)

Macrobiotic \Mac`ro*bi*ot"ic\, a. [Gr. ? long-lived; ? long + ?
   life: cf. F. macrobiotique.]
   Long-lived. -- Dunglison.

Source : WordNet®

macrobiotic
     adj : of or relating to the theory or practice of macrobiotics;
           "macrobiotic diet"