/ ˌbaɪəˈlɒdʒɪkl; NAmE -ˈlɑːdʒ-/ adjective
1.
connected with the science of biology :
the biological sciences
2.
connected with the processes that take place within living things :
the biological effects of radiation
the biological control of pests (= using living organisms to destroy them, not chemicals)
a child's biological parents (= natural parents, not the people who adopted him / her)
3.
( of washing powder, etc. ) using enzymes (= chemical substances that are found in plants and animals) to get clothes, etc. clean :
biological and non-biological powders