# letheon

> English word · Noun · IPA /ˈliːθiːən/

## Definitions
1. sulphuric ether used as an anaesthetic agent.

## Etymology
From New Latin lēthēon, from Ancient Greek λήθη (lḗthē, “forgetting, forgetfulness”).

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