acid · noun C or U /ˈæs.ɪd/Full view
B2 a liquid substance that can react chemically with and sometimes dissolve other materials
Dictionary examples:

hydrochloric/fatty acid

Vinegar is an acid.

Learner example:

We saw a little black dragon with scales like iron charging [at] us and spitting acid. (First Certificate in English; B2; Portuguese)

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