Top Definition
A very long, skinny, curved blade sword used throughout various fantasy RPGs. The most noted being Final Fantasy and Chrono Trigger. The blade is very powerful and difficult to wield efficiently, but any creature it strikes down cannot be ressurected by any means.

Sephiroth is perhaps the most famous wielder of the Masemune, which he used to slaughter many in Final Fantasy 7
While playing Final Fantasy 7, I used Aeris as my main spell caster. She grew to such a high level, then Sephiroth killed her with the Masemune, so I was forced to find a replacement character. I vow to always read game spoilers from now on.
by My Extra Spleen July 13, 2005

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