corona
noun [ C usually singular ] specialized uk/kəˈrəʊ.nə/ us/kəˈroʊ.nə/ coronae uk/-niː/ us/-niː/
environment （指在日食期间的）日冕;月华
a circle of light that can sometimes be seen around the moon at night, or around the sun during an eclipse (= a time when the moon is positioned exactly between the sun and the earth)
environment 冕（星系）
the outer atmosphere of a star, for example the sun
anatomy （身体组织）冠，冠状部
the top rounded part of a body part such as a tooth or the skull