# periastron

> English word · Noun · IPA /pɛɹɪˈæstɹən/

## Definitions
1. That point of the orbit of a celestial body which is closest to the star around which the body is orbiting.

## Etymology
From Ancient Greek περί (perí, “around”) + ἄστρον (ástron, “star”).

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