Biological - definition of biological by The Free Dictionary 1 Of, relating to, caused by, or affecting life or living organisms: biological processes such as growth and digestion 2 Having to do with biology 3 Related by genetic lineage: the child's biological parents; his biological sister 4 Being male or female by having the chromosomes for that sex: a biological female
biological - WordReference. com Dictionary of English Biology of or relating to biology: biological sciences using chemical or living organisms (such as viruses, etc ) to harm an enemy:[before a noun] biological weapons