- 1connected with the science of biology the biological sciences
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- 2connected 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 laundry soap, etc.) using enzymes (= chemical substances that are found in plants and animals) to get clothes, etc. clean biological and non-biological detergents
NAmE//ˌbaɪəˈlɑdʒɪkli//
adverbSee biological in the Oxford Advanced Learner's DictionaryCheck pronunciation: biological