noun
a single eyebrow that appears to be connected across the forehead
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The scientist's monobrow furrowed as he concentrated on his research.
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I can't believe she still hasn't plucked her monobrow!
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That guy's monobrow is so thick, it's like a caterpillar on his forehead.
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The dark cloud of doubt cast a shadow over his face, creating a metaphorical monobrow.