From Marion Boddy-Evans,
Your Guide to Painting.
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Definition: A painting done on more than one canvas (or board or paper) has a different name depending on how many parts there are to it.

• Two parts = diptych
• Three parts = triptych
• Four parts = tetraptych
• Five parts = pentaptych
• Six parts = hexaptych
• Seven parts = heptaptych
• Eight parts = octaptych
• Four or more parts is also called a polyptych.

The term "multiples" means something slightly different, and has been used since the mid-1960s for art that isn't a one-off, unique piece, but rather could be reproduced any number of times. The term was adopted by artists who rejected originality and ownership of individual pieces of art as a concepts.