---
title: "BIP39 Word #17: acoustic — Seed Phrase Mnemonic Word"
url: "https://bip39-phrase.com/bip39-word/acoustic/"
language: "en"
updated: "2026-10-19T00:00:00+00:00"
---

Word #17 00000010000 

# acoustic — BIP39 word #17

"**acoustic**" is word #17 of the 2048 words in the official BIP39 English wordlist, between [acid](/bip39-word/acid/) and [acquire](/bip39-word/acquire/). In a seed phrase it stands for the 11-bit value `00000010000`, decimal index 16\. 

/əˈkuːstɪk/  · _adjective:_ relating to sound, or played without electric amplification 

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

## Binary Representation

A single 1-bit: 16 is a power of two, like the indexes of [ability](/bip39-word/ability/), [able](/bip39-word/able/), [above](/bip39-word/above/), [absurd](/bip39-word/absurd/), [advice](/bip39-word/advice/), [amount](/bip39-word/amount/), [avoid](/bip39-word/avoid/), [cactus](/bip39-word/cactus/), [divorce](/bip39-word/divorce/) and [length](/bip39-word/length/).

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

[link](/bip39-word/link/)[dragon](/bip39-word/dragon/)[capital](/bip39-word/capital/)[bamboo](/bip39-word/bamboo/)[anxiety](/bip39-word/anxiety/)[alcohol](/bip39-word/alcohol/)[abandon](/bip39-word/abandon/)[adapt](/bip39-word/adapt/)[action](/bip39-word/action/)[across](/bip39-word/across/)[acquire](/bip39-word/acquire/) 

Position

Hex Index

0x010

4-Letter Prefix

acou

## About "acoustic" in BIP39

- "acoustic" has 8 letters, but the first three, **"aco"**, 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.
- "acoustic" appears in three of the 24 official English [test vectors](https://github.com/trezor/python-mnemonic/blob/master/vectors.json) of BIP39: vectors #3 (word 7 of 12), #7 (words 7 and 15 of 18) and #11 (words 7, 15 and 23 of 24). Every official vector passes the [checksum checker](/bip39-checksum-checker/), and [How BIP39 works](/how-bip39-works/) shows how the entropy turns into such words.

Official test vector #3

[letter](/bip39-word/letter/) [advice](/bip39-word/advice/) [cage](/bip39-word/cage/) [absurd](/bip39-word/absurd/) [amount](/bip39-word/amount/) [doctor](/bip39-word/doctor/) acoustic [avoid](/bip39-word/avoid/) [letter](/bip39-word/letter/) [advice](/bip39-word/advice/) [cage](/bip39-word/cage/) [above](/bip39-word/above/) 

## Word #17 in the Other 9 BIP39 Wordlists

[Czech](/czech/) arogance 

[French](/french/) abusif 

[Italian](/italian/) acrilico 

[Japanese](/japanese/) あたえる 

[Korean](/korean/) 가족 

[Portuguese](/portuguese/) abutre 

[Spanish](/spanish/) acelga 

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

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

## More BIP39 Words Starting with "A"

[ #13 account ](/bip39-word/account/)[ #14 accuse ](/bip39-word/accuse/)[ #15 achieve ](/bip39-word/achieve/)[ #16 acid ](/bip39-word/acid/)[ #18 acquire ](/bip39-word/acquire/)[ #19 across ](/bip39-word/across/)[ #20 act ](/bip39-word/act/)[ #21 action ](/bip39-word/action/) 

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

## Seed phrase, key and recovery guides

- [BIP 157 Client-Side Block Filtering: Compact Filters Explained](/bip-157-client-side-block-filtering/)
- [Bitcoin Core Seed Phrase: Why There Is None and How to Back Up](/bitcoin-core-seed-phrase-backup-guide/)
- [BIP38 Encrypted Private Keys: 6P Format and How to Decrypt](/bip38/)

[ Full BIP39 Wordlist ](/)