1 adj Biological is used to describe processes and states that occur in the bodies and cells of living things.
usu ADJ n
The living organisms somehow concentrated the minerals by biological processes..., This is a natural biological response.
biologically adv ADV with cl/group, ADV with v
Much of our behaviour is biologically determined...
2 adj Biological is used to describe activities concerned with the study of living things.
...the university's school of biological sciences.
3 adj Biological weapons and biological warfare involve the use of bacteria or other living organisms in order to attack human beings, animals, or plants.
usu ADJ n
Such a war could result in the use of chemical and biological weapons.
4 adj Biological pest control is the use of bacteria or other living organisms in order to destroy other organisms which are harmful to plants or crops.
...Jim Litsinger, a consultant on biological control of agricultural pests.
5 adj A child's biological parents are the man and woman who caused him or her to be born, rather than other adults who look after him or her. ADJ n
(=natural) ...foster parents for young teenagers whose biological parents have rejected them.
biological clock ( biological clocks plural ) Your biological clock is your body's way of registering time. It does not rely on events such as day or night, but on factors such as your habits, your age, and chemical changes taking place in your body. n-count oft poss N
For women, the `biological clock' governs the time for having children.
Biological diversity is the same as biodiversity. n-uncount
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