# cyclin

> English word · Noun · frequency rank #58,627

## Definitions
1. Any of a group of proteins whose presence in a cell varies through its cycle, and that regulates this cycle by forming a complex with kinase

## Etymology
From cycle + -in.

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