noun
a chemical compound found in chili peppers that produces a burning sensation in the mouth
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Capsaicin is the active component in chili peppers that gives them their spicy heat.
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Eating foods with capsaicin can make your mouth feel like it's on fire!
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I can't handle the capsaicin level in that hot sauce, it's too intense for me.
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His words were like capsaicin, burning through any defenses I had left.