Englishfor English speakers
commercial
Noun
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A commercial is an advertisement on TV or radio.
The actress recently appeared in a TV commercial for Meadowcup butter.
acid
Noun
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An acid is a liquid with a high number of hydrogen ions in it that can burn things.
Fruit often has a little acid in it.
The acid burned the table.
Acids taste sour but bases taste bitter.
acid
Adjective
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If something is acid, it is like an acid, from an acid, or acidic.
The factories nearby have made the lake more acid.
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If something has an acid taste, it is sour.
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If something said or done to you was acid, it was hurtful.
Their acid comments are painful.