noun ·Rare ·Advanced level

Definitions

Noun

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

Antonyms

All antonyms

apastron

Etymology

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

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.