1

acid

noun

Definition of acid

  1. 1 :  a sour substance; specifically :  any of various typically water-soluble and sour compounds that in solution are capable of reacting with a base (see 1base 7a) to form a salt, redden litmus, and have a pH less than 7, that are hydrogen-containing molecules or ions able to give up a proton to a base, or that are substances able to accept an unshared pair of electrons from a base

  2. 2 :  something incisive, biting, or sarcastic a social satire dripping with acid

  3. 3 :  lsd

acidy

\ˈa-sə-dē\ adjective

Examples of acid in a sentence

  1. He washes his windows with an acid solution of vinegar and water.

  2. with her acid personality, my aunt could be relied upon to bring some much-needed balance to the holiday gush

Origin and Etymology of acid

see 2acid


First Known Use: 1650

Other Chemical Engineering Terms


2

acid

play
adjective ac·id \ˈa-səd\

Definition of acid

  1. 1a :  sour, sharp, or biting to the taste an acid flavorb :  sharp, biting, or sour in manner, disposition, or nature an acid individual an acid personalityc :  sharply clear, discerning, or pointed an acid wit acid criticismd :  piercingly intense and often jarring acid yellow

  2. 2a :  of, relating to, or being an acid; also :  having the reactions or characteristics of an acid acid soil an acid solutionb of salts and esters :  derived by partial exchange of replaceable hydrogen acid sodium carbonate NaHCO3c :  containing or involving the use of an acid (as in manufacture) an acid bathd :  marked by or resulting from an abnormally high concentration of acid acid indigestion

  3. 3 :  relating to or made by a process in which the furnace is lined with acidic material and an acidic slag is used acid steel

  4. 4 :  rich in silica acid rocks

acidly

adverb

acidness

noun

Examples of acid in a sentence

  1. the acids in your stomach

  2. the kinds of acid found in your stomach

Origin and Etymology of acid

French or Latin; French acide, from Latin acidus, from acēre to be sour — more at acet-


First Known Use: 1649

Other Chemical Engineering Terms



ACID Defined for English Language Learners

1

acid

noun

Definition of acid for English Language Learners

  • : of, relating to, or having the qualities of an acid

  • : sharp, strong, and critical in tone


2

acid

play
adjective ac·id \ˈa-səd\

Definition of acid for English Language Learners

  • chemistry : a chemical with a sour taste that forms a salt when mixed with a base


ACID Defined for Kids

1

acid

play
adjective ac·id \ˈa-səd\

Definition of acid for Students

  1. 1 :  having a taste that is sour, bitter, or stinging

  2. 2 :  harsh or critical in tone acid remarks

  3. 3 :  of, relating to, or like an acid an acid solution

acidly

adverb spoke acidly

2

acid

play
noun

Definition of acid for Students

  1. :  a chemical compound that tastes sour and forms a water solution which turns blue litmus paper red


Medical Dictionary

1

acid

play
adjective ac·id \ˈas-əd\

Medical Definition of acid

  1. 1:  sour, sharp, or biting to the taste

  2. 2a:  of, relating to, or being an acid; also :  having the reactions or characteristics of an acid an acid solutionbof salts and esters :  derived by partial exchange of replaceable hydrogen acid sodium carbonate NaHCO3c:  marked by or resulting from an abnormally high concentration of acid acid indigestion—not used technically


2

acid

noun

Medical Definition of acid

  1. 1:  a sour substance; specifically :  any of various typically water-soluble and sour compounds that in solution are capable of reacting with a base to form a salt, that redden litmus, that have a pH less than 7, and that are hydrogen-containing molecules or ions able to give up a proton to a base or are substances able to accept an unshared pair of electrons from a base

  2. 2:  lsd



Seen and Heard

What made you want to look up acid? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

holding stubbornly to a belief or view

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

  • manet-jeanne-spring
  • Which is a synonym of chaffer?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ