---
title: "BIP39 Word #736: fossil — Seed Phrase Mnemonic Word"
url: "https://bip39-phrase.com/bip39-word/fossil/"
language: "en"
updated: "2026-10-19T00:00:00+00:00"
---

Word #736 01011011111 

# fossil — BIP39 word #736

"**fossil**" is word #736 of the 2048 words in the official BIP39 English wordlist, between [forward](/bip39-word/forward/) and [foster](/bip39-word/foster/). In a seed phrase it stands for the 11-bit value `01011011111`, decimal index 735\. 

/ˈfɒsᵊl/  · _noun:_ the remains of an ancient animal or plant preserved in rock 

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

## Binary Representation

Eight 1-bits and three 0-bits; 165 of the 2048 indexes have exactly eight 1-bits.

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

[swim](/bip39-word/swim/)[brief](/bip39-word/brief/)[know](/bip39-word/know/)[episode](/bip39-word/episode/)[fault](/bip39-word/fault/)[garment](/bip39-word/garment/)[fly](/bip39-word/fly/)[foot](/bip39-word/foot/)[fork](/bip39-word/fork/)[forum](/bip39-word/forum/)[forward](/bip39-word/forward/) 

Position

Hex Index

0x2DF

4-Letter Prefix

foss

## About "fossil" in BIP39

- "fossil" has 6 letters, but the first four, **"foss"**, already identify it, because **"fos"** also begins [foster](/bip39-word/foster/).
- **"foss"** is unique only within the English list: it also begins fossile in the [French list](/french/), fosso in the [Italian list](/italian/) and fossa in the [Portuguese list](/portuguese/), so a four-letter backup should say which list it uses.

## Word #736 in the Other 9 BIP39 Wordlists

[Czech](/czech/) leden 

[French](/french/) éteindre 

[Italian](/italian/) gaudio 

[Japanese](/japanese/) ざっし 

[Korean](/korean/) 비타민 

[Portuguese](/portuguese/) esbelto 

[Spanish](/spanish/) fogata 

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

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

## Similar Words — Check Carefully During Recovery

Words sharing the first three letters "fos":

[foster](/bip39-word/foster/) 

## More BIP39 Words Starting with "F"

[ #732 fork ](/bip39-word/fork/)[ #733 fortune ](/bip39-word/fortune/)[ #734 forum ](/bip39-word/forum/)[ #735 forward ](/bip39-word/forward/)[ #737 foster ](/bip39-word/foster/)[ #738 found ](/bip39-word/found/)[ #739 fox ](/bip39-word/fox/)[ #740 fragile ](/bip39-word/fragile/) 

[View all words starting with "F" ](/bip39-words/f/) 

## Seed phrase, key and recovery guides

- [How to Restore a Wallet From a Seed Phrase: Step by Step](/restore-wallet-from-seed-phrase/)
- [xpub, ypub and zpub: Extended Public Keys Explained](/xpub-ypub-zpub/)
- [SLIP-39 vs BIP39: Shamir Backup and 20-Word Shares Explained](/slip39-vs-bip39/)

[ Full BIP39 Wordlist ](/)