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Editor(s): Nick Bisceglia |. Subscribe. Cell biology is the study of cell structure and function, and it revolves around the concept that the cell is the fundamental unit of life. Focusing on the cell permits a detailed understanding of the tissues and organisms that cells compose.
Definition of biology. 1  1 : a branch of knowledge that deals with living organisms and vital processes advances in the field of biology a biology textbook. 2  2a : the plant and animal life of a region or environment the biology of the rain forestb : the life processes especially of an organism or group the biology of cancer cells; broadly : ecology.