← DefinitionshareGuessacidnounA chemical substance that can dissolve metals, turn blue litmus paper red, and react with bases to form salts. Acids have a sour taste and a pH less than 7.adjectiveHaving a sharp, sour taste, like that of lemon juice or vinegar.SynonymssouradjectivesharpadjectivebitteradjectiveAntonymsbasenounsweetadjectivealkalineadjective