biological

Universal Words 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 insect pests (= using living organisms to destroy them, not chemicals) * a child's biological parents (= natural, not adoptive parents) 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