Single-edged (biased) blade

Japanese: 片(偏)刃 - かたは
Single-edged (biased) blade

...A general term for tools that cut, scrape, or carve with a cutting edge where two sharp surfaces meet. A tool with a blade on both sides, like a sword, is called a moroha or ryoba, while a tool with a blade on only one side, like a katana, is called a kataha. This distinction has been made in Japan since the Nara period, and the word katana comes from the word katana, which means single-edged blade (na is an old word for blade).

*Some of the terminology explanations that mention "single (biased) blade" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…二つの面が鋭く交わる刃先cutting edgeによって,切り,削り,彫る道具の総称。剣のように身の両側に刃がつくものを諸刃(もろは)または両刃(りようば),刀のようにその片側に刃がつくものを片(偏)刃(かたは)と呼ぶ。こうした呼び分けは,日本では奈良時代以来行われ,〈かたな〉の語も片刃(〈な〉は刃の古称)に由来する。…

※「片(偏)刃」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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