noun
egg - an oval or round object laid by a female bird, reptile, fish, or invertebrate, usually containing a developing embryo
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The scientist conducted an experiment using an acid egg to test its reaction with different substances.
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I heard that acid eggs are used in chemistry labs for experiments.
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Don't mess with that acid egg, it's dangerous!
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Her words were like an acid egg, burning through his defenses and leaving him vulnerable.