natural science

noun

1. a science or knowledge of objects or processes observable in nature, as biology or physics, as distinguished from the abstract or theoretical sciences, as mathematics or philosophy.

noun

1. the sciences collectively that are involved in the study of the physical world and its phenomena, including biology, physics, chemistry, and geology, but excluding social sciences, abstract or theoretical sciences, such as mathematics, and applied sciences
2. any one of these sciences

1. A science, such as biology, chemistry, or physics, that deals with the objects, phenomena, or laws of nature and the physical world.