n.
Pronunciation: ˌ as-tr ə - ' fi-ziks
Function: noun plural but singular or plural in construction
Etymology: International Scientific Vocabulary
Date: 1890
: a branch of astronomy dealing especially with the behavior, physical properties, and dynamic processes of celestial objects and phenomena
– as · tro · phys · i · cal \ -zi-k ə l \ adjective
– as · tro · phys · i · cal · ly \ -zi-k( ə -)l ē \ adverb
– as · tro · phys · i · cist \ - ' fi-z ə -sist, - ' fiz-sist \ noun