Main Entry:

as·tro·phys·ics

Pronunciation:

\ˌas-trə-ˈfi-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-kəl\ adjective

— as·tro·phys·i·cal·ly \-zi-k(ə-)lē\ adverb

— as·tro·phys·i·cist \-ˈfi-zə-sist, -ˈfiz-sist\ noun