A-po-tome » a Poe tome. Note: the proper pronunciation is (uh-POT-uh-mee).

http://en.wikipedia.org/wiki/Apotome

http://www.daviddarling.info/encyclopedia/A/apotome.html

And now for some more fun from one of my favorite sites …

Omnificent English Dictionary In Limerick Form (OEDILF)

Apotome by Jonathan M. Guberman

Rather oddly, my botched-up lobotomy
Parallels Euclid's dichotomy.
Like this poor brain of mine,
What remained of his line
Was irrational: only apotome.

An interesting aside about Edgar Allan Poe …

The E. A. Poe Cryptographic Challenge has been solved!