Charles Hutton's Dictionary (1795) shows "parallelopiped" and "parallelopipedon", showing the influence of the combining form "parallelo-", as if the second element were "pipedon" rather than "epipedon". Noah Webster (1806) includes the spelling "parallelopiped". The 1989 edition of the "Oxford English Dictionary" describes "parallelopiped" (and "parallelipiped") explicitly as incorrect forms, but these are listed without comment in the 2004 edition, and only pronunciations with the emphasis on the fifth syllable "pi" () are given.