# simian crease

> English word · Noun

## Definitions
1. A crease that extends across the palm of the human hand, formed by the fusion of the two palmar creases, found especially in people with Down syndrome.

## Etymology
So called because it resembles the usual condition of non-human simians.

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