dip‧tych /ˈdɪptɪk/ 
 noun [countable][
Date: 1600-1700; 
Language: Late Latin; 
Origin: diptycha, from Greek, from diptychos 'folded in two']
 a picture made in two parts which can be closed like a book
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triptych  [TahlilGaran] Dictionary of Contemporary English ▲