Tessaiga

Kana       てつ
てっ
さい
さい
きば
Kanji
Pronounciation [tetsu]
[teQ-]
[kuda-]
[sai-]
[kiba]
[-ga]
Meaning iron -crushing  fang

Inuyasha

Kana       いぬ
いぬ
よる
また
しゃ
Kanji
Pronounciation [inu]
[inu]
[yoru]
[ya-]
[mata]
[-sha]
Meaning dog night crotch
female demon
So the sword is tessaiga.