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astrophysics

UK:**UK and possibly other pronunciationsUK and possibly other pronunciations/ˌæstrəʊˈfɪzɪks/US:USA pronunciation: IPA and respellingUSA pronunciation: IPA/ˌæstroʊˈfɪzɪks/ ,USA pronunciation: respelling(as′trō fiz′iks)


WordReference Random House Learner's Dictionary of American English © 2026
as•tro•phys•ics /ˌæstroʊˈfɪzɪks/USA pronunciation   n. [uncountable; used with a singular verb]
  1. 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 © 2026
as•tro•phys•ics  (as′trō fiz′iks),USA pronunciation n. (used with a sing. v.)
  1. 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
as′tro•phys′i•cal, adj. 

Collins Concise English Dictionary © HarperCollins Publishers::
astrophysics /ˌæstrəʊˈfɪzɪks/ n
  1. (functioning as singular) the branch of physics concerned with the physical and chemical properties, origin, and evolution of celestial bodies
ˌastroˈphysicist n
'astrophysics' also found in these entries (note: many are not synonyms or translations):

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