1. (

• acid

) any of various water-soluble compounds having a sour taste and capable of turning litmus red and reacting with a base to form a salt ;

2. (

• acid ,
• back_breaker ,
• battery-acid ,
• dose ,
• dot ,
• Elvis ,
• loony_toons ,
• Lucy_in_the_sky_with_diamonds ,
• pane ,
• superman ,
• window_pane ,
• Zen

) street name for lysergic acid diethylamide ;

1. (

• acerb ,
• acerbic ,
• acid ,
• acrid ,
• bitter ,
• blistering ,
• caustic ,
• sulfurous ,
• sulphurous ,
• virulent ,
• vitriolic

) harsh or corrosive in tone; "an acerbic tone piercing otherwise flowery prose"; "a barrage of acid comments"; "her acrid remarks make her many enemies"; "bitter words"; "blistering criticism"; "caustic jokes about political assassination, talk-show hosts and medical ethics"; "a sulfurous denunciation"; "a vitriolic critique" ;

2. (

• acidic ,
• acid ,
• acidulent ,
• acidulous

) being sour to the taste ;

3. (

• acid

) having the characteristics of an acid; "an acid reaction" ;