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Showing results for acid. Search instead for aci.
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.

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

Sulphur is used to make sulphuric acid, which is used for processing copper, cobalt and nickel and also for the extraction of lithium.

From BBC • Mar. 26, 2026

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

From Salon • Mar. 25, 2026

Yet Araghchi could deploy acid humor, anger and threats in talks, too.

From The Wall Street Journal • Mar. 23, 2026

Dimple knew how he felt; the ringtone had doused stomach acid on the butterflies fluttering pleasantly in her stomach.

From "When Dimple Met Rishi" by Sandhya Menon

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.