# Threefish

> English word · Proper noun

## Definitions
1. A symmetric-key tweakable block cipher involving the Skein hash function.

## Etymology
From three + fish, modelled on the earlier Twofish.

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