# semiperimeter

> English word · Noun

## Definitions
1. Half of the perimeter (sum of the lengths of the sides) of a polygon. The term is typically applied to triangles, cyclic quadrilaterals, and regular polygons.

## Etymology
From semi- + perimeter.

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