noun
a person who has an extreme fear of germs and avoids contact with other people or objects that may be contaminated
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The germaphobe always carries hand sanitizer with them wherever they go.
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My friend is such a germaphobe, she won't even touch a doorknob without using a tissue.
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I can't stand being around that germaphobe, they're always freaking out about getting sick.
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She was a germaphobe when it came to her personal information, never sharing anything with anyone.