# FOIL

> English word · Proper noun · frequency rank #10,212

## Definitions
1. An acronym for the algorithm for multiplying two binomials.

## Etymology
Acronym of first outer inner last or similar.

## Easily confused with
- **for** (https://plainspell.com/en/vs/foil-vs-for)
- **fox** (https://plainspell.com/en/vs/foil-vs-fox)
- **FYI** (https://plainspell.com/en/vs/foil-vs-fyi)
- **foo** (https://plainspell.com/en/vs/foil-vs-foo)
- **foy** (https://plainspell.com/en/vs/foil-vs-foy)
- **FTL** (https://plainspell.com/en/vs/foil-vs-ftl)
- **fou** (https://plainspell.com/en/vs/foil-vs-fou)
- **full** (https://plainspell.com/en/vs/foil-vs-full)
- **four** (https://plainspell.com/en/vs/foil-vs-four)
- **food** (https://plainspell.com/en/vs/foil-vs-food)
- **form** (https://plainspell.com/en/vs/foil-vs-form)
- **foot** (https://plainspell.com/en/vs/foil-vs-foot)
- **fuel** (https://plainspell.com/en/vs/foil-vs-fuel)
- **ford** (https://plainspell.com/en/vs/foil-vs-ford)
- **fort** (https://plainspell.com/en/vs/foil-vs-fort)
- **fool** (https://plainspell.com/en/vs/foil-vs-fool)
- **folk** (https://plainspell.com/en/vs/foil-vs-folk)
- **foul** (https://plainspell.com/en/vs/foil-vs-foul)
- **fork** (https://plainspell.com/en/vs/foil-vs-fork)
- **fond** (https://plainspell.com/en/vs/foil-vs-fond)

## Common misspellings (5)
`ffoil`, `fiol`, `foill`, `foli`, `ofil`

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