EXOSPHERE Scrabble 21 Words With Friends 21 Definition noun the outermost atmospheric layer. Examples “"Scientists weren't even sure Dione would be big enough to hang on to an exosphere" ('Cassini Detects Hint of Fresh Air at Dione', Cassini Solstice Mission, JPL, Mar. 02, 2012)” See all 137 words you can make from EXOSPHERE → 9-letter words Words starting with E Words ending with E ← Unscramble different letters