as ‧ tro ‧ phys ‧ ics /ˌæstrəʊˈfɪzɪks $ ˌæstrə-, -troʊ-/ BrE AmE noun [uncountable]
the scientific study of the chemical structure of the stars and the forces that influence them
—astrophysicist /-ˈfɪzəsəst, -ˈfɪzɪsəst/ noun [countable]
as ‧ tro ‧ phys ‧ ics /ˌæstrəʊˈfɪzɪks $ ˌæstrə-, -troʊ-/ BrE AmE noun [uncountable]
the scientific study of the chemical structure of the stars and the forces that influence them
—astrophysicist /-ˈfɪzəsəst, -ˈfɪzɪsəst/ noun [countable]
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012