Definition of acid adjective from the Oxford Advanced Learner's Dictionary

     

    acid

     adjective
    adjective
    BrE BrE//ˈæsɪd//
     
    ; NAmE NAmE//ˈæsɪd//
     
    Describing unpleasant traits
     
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  1. 1 (specialist) that contains acid or has the essential characteristics of an acid; that has a pH of less than seven Rye is tolerant of poor, acid soils. compare alkaline
  2. 2that has a bitter sharp taste synonym sour acid fruit It’s a very juicy fruit with a slightly acid flavour. Synonymsbitterpungent sour acrid sharp acidThese words all describe a strong, unpleasant taste or smell.bitter (of a taste or smell) strong and usually unpleasant; (of food or drink) having a bitter taste.pungent (of a smell or taste) strong and usually unpleasant; (of food or smoke) having a pungent smell or taste:the pungent smell of burning rubbersour (of a taste) bitter like the taste of a lemon or of fruit that is not ripe; (of food or drink) having a sour taste:Too much pulp produces a sour wine.acrid (of a smell or taste) strong and unpleasant; (of smoke) having an acrid smell:acrid smoke from burning tyressharp (of a taste or smell) strong and slightly bitter; (of food or drink) having a sharp taste:The cheese has a distinctively sharp taste.acid (of a taste or smell) bitter, like the taste of a lemon or of fruit that is not ripe; (of food or drink) having an acid taste.which word? A bitter taste is usually unpleasant, but some people enjoy the bitter flavour of coffee or chocolate. No other word can describe this flavour. A sharp or pungent flavour is more strong than unpleasant, especially when describing cheese. Sharp, sour and acid all describe the taste of a lemon or a fruit that is not ripe. An acrid smell is strong and unpleasant, especially the smell of smoke or burning, but not the smell of food.Patterns a(n) bitter/​pungent/​sour/​acrid/​sharp/​acid taste/​flavour a(n) bitter/​pungent/​acrid/​sharp/​acid smell/​odour a(n) bitter/​sour/​sharp/​acid fruit pungent/​sharp cheese pungent/​acrid smoke
  3. 3(of a person’s remarks) critical and unkind synonym sarcastic, cutting an acid wit See related entries: Describing unpleasant traits
  4. Word Origin early 17th cent. (in the sense ‘sour-tasting’): from Latin acidus, from acere ‘be sour’.
See the Oxford Advanced American Dictionary entry: acid