A polyptych (/ˈpɒlɪptɪk/ pol-ip-tik; Greek: polu- "many" and ptychē "fold") generally refers to a painting (usually panel painting) which is divided into sections, or panels. The terminology that follows is in relevance to the number of panels integrated into a particular piece of work: "diptych" describes a two-part work of art; "triptych" describes a three-part work; tetraptych or quadriptych describes 4 parts; pentaptych describes 5 parts; hexaptych describes 6 parts; heptaptych describes 7 parts; and octaptych is the term used for an eight-part, or eight-panel, work of art.
http://en.wikipedia.org/wiki/Polyptych
４月１日のミステーク関連。化学というかギリシャ語の数詞でＯＫのようです。
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◇ 有機化学 アルカン - Wikibooks
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◇ テルペン - Wikipedia
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