ox ‧ ide /ˈɒksaɪd $ ˈɑːk-/ BrE AmE noun [uncountable and countable]
[ Date: 1700-1800 ; Language: French ; Origin: oxygène 'oxygen' + acide 'acid' ]
a substance which is produced when a substance is combined with oxygen:
iron oxide
ox ‧ ide /ˈɒksaɪd $ ˈɑːk-/ BrE AmE noun [uncountable and countable]
[ Date: 1700-1800 ; Language: French ; Origin: oxygène 'oxygen' + acide 'acid' ]
a substance which is produced when a substance is combined with oxygen:
iron oxide
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012