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WordReference Random House Learner's Dictionary of American English © 2024as•tro•phys•ics /ˌæstroʊˈfɪzɪks/USA pronunciation n. [uncountable; used with a singular verb]- Astronomythe branch of astronomy that deals with the physical properties of celestial bodies and the interaction between matter and radiation.
as•tro•phys•i•cist /ˌæstroʊˈfɪzəsɪst/USA pronunciation n. [countable] WordReference Random House Unabridged Dictionary of American English © 2024as•tro•phys•ics (as′trō fiz′iks),USA pronunciation n. (used with a sing. v.) - Astronomythe branch of astronomy that deals with the physical properties of celestial bodies and with the interaction between matter and radiation in the interior of celestial bodies and in interstellar space.
- 1885–90; astro- + physics
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