Source : Webster's Revised Unabridged Dictionary (1913)

Biologic \Bi`o*log"ic\, Biological \Bi`o*log"ic*al\, a.
   Of or relating to biology. -- {Bi`o*log"ic*al*ly}, adv.

Source : WordNet®

biological
     adj 1: pertaining to biology or to life and living things [syn: {biologic}]
     2: of parents and children; related by blood; "biological
        child" [ant: {adoptive}]