Webster's English Dictionary

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chromosphere

chro.mo.sphere \'kro--m*-.sfi(*)r\ \.kro--m*-'sfi(*)r-ik, -'sfer-\ n : the 
   lower part of the atmosphere of the sun thousands of miles thick and  
   composed chiefly of hydrogen gas; also : a similar portion of the 
   atmosphere of any star - chro.mo.sphe.ric aj