noun
a person who has an extreme fear or phobia of spiders
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The arachnophobe experienced intense fear when a spider crawled across the floor.
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My friend is such an arachnophobe that she screams at the sight of a tiny spider.
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Dude, that guy is a total arachnophobe - he freaks out at the mere mention of spiders.
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Her arachnophobia was like a dark cloud hanging over her, affecting every aspect of her life.