Quote:
Originally Posted by Tri-ring
It's "Kai[効]" or efficacy.
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Eh?
The first thing that came to mind was 'kou', was wondering if 'kai' was some special reading :|
効く 【きく】 (v5k) to be effective, (P)
効き目 【ききめ】 (n) effect, virtue, efficacy, impression, (P)
効 【こう】 (n) efficacy, benefit, efficiency, effect, result, success
And then related words off of it...
効果 【こうか】 (n,adj-no) effect, effectiveness, efficacy, result, (P)
効率 【こうりつ】 (n) efficiency, (P)
発効 【はっこう】 (n) coming into effect, (P)
And so on...