# acid

> English word · Adjective · IPA /ˈæsɪd/ · frequency rank #3,272

## Definitions
1. Sour, sharp, or biting to the taste; tart; having the taste of vinegar.
2. Sour-tempered.
3. Of or pertaining to an acid; acidic.
4. Denoting a musical genre that is a distortion (as if hallucinogenic) of an existing genre, as in acid house, acid jazz, acid rock.

## Etymology
Etymology tree
Proto-Indo-European *h₂eḱ-der.
Latin aceō
Proto-Indo-European *dʰeh₁-der.
Latin -idus
Latin acidusbor.
French acidebor.
English acid
From French acide, from Latin acidus (“sour, acid”), from aceō (“to be sour”). Doublet of agita.

## Easily confused with
- **AD** (https://plainspell.com/en/vs/acid-vs-ad)
- **ai** (https://plainspell.com/en/vs/acid-vs-ai)
- **and** (https://plainspell.com/en/vs/acid-vs-and)
- **air** (https://plainspell.com/en/vs/acid-vs-air)
- **ACT** (https://plainspell.com/en/vs/acid-vs-act)
- **add** (https://plainspell.com/en/vs/acid-vs-add)
- **aid** (https://plainspell.com/en/vs/acid-vs-aid)
- **aim** (https://plainspell.com/en/vs/acid-vs-aim)
- **Ali** (https://plainspell.com/en/vs/acid-vs-ali)
- **API** (https://plainspell.com/en/vs/acid-vs-api)
- **Ari** (https://plainspell.com/en/vs/acid-vs-ari)
- **AMD** (https://plainspell.com/en/vs/acid-vs-amd)
- **ain** (https://plainspell.com/en/vs/acid-vs-ain)
- **ACL** (https://plainspell.com/en/vs/acid-vs-acl)
- **AMI** (https://plainspell.com/en/vs/acid-vs-ami)
- **ani** (https://plainspell.com/en/vs/acid-vs-ani)
- **Avi** (https://plainspell.com/en/vs/acid-vs-avi)
- **aud** (https://plainspell.com/en/vs/acid-vs-aud)
- **ACS** (https://plainspell.com/en/vs/acid-vs-acs)
- **ard** (https://plainspell.com/en/vs/acid-vs-ard)

## Common misspellings (5)
`accid`, `acdi`, `acidd`, `aicd`, `caid`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/acid