# mononucleosis

> English word · Noun · IPA /ˌmɑnoʊnukliˈoʊsɪs/ · frequency rank #92,891

## Definitions
1. A viral infection marked by extreme fatigue, high fever, and swollen lymph nodes.

## Etymology
From mono- + nucleus + -osis.

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