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acid

An acid is something that has a sour taste, or something that has a pH of less than 7 in chemistry. (noun)

Lemon juice and vinegar are each an example of an acid.

Acid means sour or sharp in taste, or having a pH of under 7 in chemistry. (adjective)

Lemon is an example of an acid substance.

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See acid in Webster's New World College Dictionary

See acid in American Heritage Dictionary 4

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