---
title: "BIP39 Word #16: acid — Seed Phrase Mnemonic Word"
url: "https://bip39-phrase.com/bip39-word/acid/"
language: "en"
updated: "2026-10-19T00:00:00+00:00"
---

Word #16 00000001111 

# acid — BIP39 word #16

"**acid**" is word #16 of the 2048 words in the official BIP39 English wordlist, between [achieve](/bip39-word/achieve/) and [acoustic](/bip39-word/acoustic/). In a seed phrase it stands for the 11-bit value `00000001111`, decimal index 15\. 

/ˈæsɪd/  · _noun:_ a sour chemical substance that can burn or dissolve materials 

[Russian](/ru/ "The BIP39 wordlist with Russian translations"): кислота 

## Binary Representation

Four 1-bits and seven 0-bits; 330 of the 2048 indexes have exactly four 1-bits.

One wrong bit turns it into (leftmost bit first):

[limit](/bip39-word/limit/)[draft](/bip39-word/draft/)[capable](/bip39-word/capable/)[ball](/bip39-word/ball/)[antique](/bip39-word/antique/)[album](/bip39-word/album/)[advance](/bip39-word/advance/)[abstract](/bip39-word/abstract/)[accident](/bip39-word/accident/)[accuse](/bip39-word/accuse/)[achieve](/bip39-word/achieve/) 

Position

Hex Index

0x00F

4-Letter Prefix

acid

## About "acid" in BIP39

- "acid" has 4 letters, but the first three, **"aci"**, already identify it, because **"ac"** also begins 13 other words, among them [access](/bip39-word/access/), [accident](/bip39-word/accident/), [account](/bip39-word/account/) and [accuse](/bip39-word/accuse/). Three letters are enough for only 604 of the 2048 words.
- **"acid"** is unique only within the English list: it also begins aciduler in the [French list](/french/), acido in the [Italian list](/italian/) and acidez in the [Portuguese list](/portuguese/), so a four-letter backup should say which list it uses.

## Word #16 in the Other 9 BIP39 Wordlists

[Czech](/czech/) archa 

[French](/french/) absurde 

[Italian](/italian/) acre 

[Japanese](/japanese/) あそぶ 

[Korean](/korean/) 가정 

[Portuguese](/portuguese/) absurdo 

[Spanish](/spanish/) aceite 

[Traditional Chinese](/chinese-traditional/) 國 

[Simplified Chinese](/chinese-simplified/) 国 

## More BIP39 Words Starting with "A"

[ #12 accident ](/bip39-word/accident/)[ #13 account ](/bip39-word/account/)[ #14 accuse ](/bip39-word/accuse/)[ #15 achieve ](/bip39-word/achieve/)[ #17 acoustic ](/bip39-word/acoustic/)[ #18 acquire ](/bip39-word/acquire/)[ #19 across ](/bip39-word/across/)[ #20 act ](/bip39-word/act/) 

[View all words starting with "A" ](/bip39-words/a/) 

## Seed phrase, key and recovery guides

- [SLIP-39 vs BIP39: Shamir Backup and 20-Word Shares Explained](/slip39-vs-bip39/)
- [Why You Should Never Create Your Own Seed Phrase](/why-you-should-never-create-your-own-seed-phrase/)
- [12 vs 24 Word Seed Phrase: Which Is More Secure?](/12-vs-24-word-seed-phrase/)

[ Full BIP39 Wordlist ](/)