# anaphylaxis

> English word · Noun · IPA /ˌænəfɪˈlæksɪs/ · frequency rank #47,462

## Definitions
1. Extreme sensitivity to a substance such as a foreign protein or drug.
2. A severe and rapid systemic allergic reaction to an allergen, causing a constriction of the trachea, preventing breathing; anaphylactic shock.

## Etymology
Borrowed from French anaphylaxie, coined by French physiologist and parapsychologist Charles Richet and French zoologist Paul Portier from the Ancient Greek ᾰ̓νᾰ- (ănă-, “(intensifier) thoroughly”) from ᾰ̓νᾰ́ (ănắ, “to, again, upon”) and φύλαξις (phúlaxis, “protection, watching, guarding”).

## Common misspellings (17)
`aanphylaxis`, `anahpylaxis`, `anaphhylaxis`, `anaphlyaxis`, `anaphyalxis`, `anaphylaixs`, `anaphylaxiss`, `anaphylaxsi`, `anaphylaxxis`, `anaphyllaxis`, `anaphylxais`, `anaphyylaxis`, `anapphylaxis`, `anapyhlaxis`, `annaphylaxis`, `anpahylaxis`, `naaphylaxis`

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