The science of life; that branch of knowledge which treats of living matter as distinct from matter which is not living; the study of living tissue. It has to do with the origin, structure, development, function, and distribution of animals and plants.

Study of microscopic green things that wiggle.

The science of life and living things. It studies the structure, function, growth, origin, and evolution of living organisms (plants, animals, etc.).

scientific study of living organisms