# photoperiodism

> English word · Noun

## Definitions
1. The growth, development and other responses of plants and animals according to the length of day and/or night.

## Etymology
From photoperiod + -ism.

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