치열

Etymology 1
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Noun

 * 1) ferociousness, fierceness, intensity, vigor

Usage notes
Usually not found in isolation as a noun, but as the derived adjective or adverb. The nominalized substantive form of the adjective,, is preferred instead for the noun sense of “ferociousness, etc.”

Etymology 2
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Noun

 * 1)  row of teeth

Etymology 3
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Noun

 * 1)  anal fissure

Etymology 4
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Noun

 * 1) scorching heat, extreme heat

Usage notes
Usually not found in isolation as a noun, but as the derived adjective or adverb. The nominalized substantive form of the adjective,, is preferred instead for the noun sense of “extreme heat”.

Some South Korean speakers may mistakenly consider this to be a figurative extension of the “ferociousness” sense.

Etymology 5
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Noun

 * 1)  treatment of disease-inducing heat