# polytypism

> English word · Noun

## Definitions
1. The existence of multiple types, especially of multiple subspecies.
2. The existence of multiple forms differing in only one of the dimensions of the unit cell.

## Etymology
From poly- + type + -ism.

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