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Definitions

acid

[as-id] / ˈæs ɪd /
ADJECTIVE
bitter, sour in taste
Synonyms
STRONGEST
acerbic biting piquant pungent
STRONG
sharp tart
WEAK
acidulous vinegarish vinegary
Antonyms
STRONGEST
bland dull mild
WEAK
basic kind nice sweet
ADJECTIVE
having acidic, corrosive properties
Synonyms
STRONGEST
acerbic acrid biting
STRONG
corroding dissolvent eroding rusting
WEAK
acidulous anti-alkaline bleaching disintegrative eating away erosive oxidizing
Antonyms
STRONGEST
kind nice sweet
WEAK
basic bland
ADJECTIVE
bitter in words or behavior
Synonyms
STRONGEST
acerbic biting caustic mordant nasty sarcastic stinging trenchant vitriolic
STRONG
cutting dry offensive sharp
WEAK
harsh hateful hurtful
Antonyms
STRONGEST
calm kind mild nice pleasant
WEAK
basic bland sweet
NOUN
lysergic acid diethylamide, lsd
Synonyms
STRONG
blotter candy cubes dot hallucinogen microdots mushrooms peyote
WEAK
California sunshine Lucy in the sky with diamonds Owsley's acid black tabs blue Owsley blue acid blue dot electric Kool-Aid green dragon instant Zen magic mushrooms mescalin orange sunshine purple haze strawberry fields sugar cubes yellow sunshine

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Beyond biology, phosphoric acid is widely used in technologies such as batteries and fuel cells because of its exceptional ability to conduct protons.

From Science Daily • Apr. 7, 2026

Products passing through the giant site range from insulin capsules and lifestyle drugs to medicated sunblock and drums of sulphuric acid.

From Barron's • Apr. 5, 2026

Her dad said afterward that acid reflux had made her vocal cords swell, necessitating the last-minute switch from live to Memorex.

From Los Angeles Times • Apr. 2, 2026

Crunch, acid, herbs, spice — little hits of contrast that make a dish feel complete.

From Salon • Mar. 25, 2026

He poured warm water into a basin and added a few drops of carbolic acid.

From "A Tree Grows in Brooklyn" by Betty Smith