natural science
From Longman Dictionary of Contemporary EnglishRelated topics: Hard sciencenatural scienceˌnatural ˈscience noun [countable, uncountable] Hchemistry, biology, and physics, considered together as subjects for study, or one of these subjectsExamples from the Corpusnatural science• But there is large-scale agreement that the aim is explanation by applying the methods of natural science.• This approach was strongly influenced by the methods of natural science.