periastron
noun/pɛɹɪˈæstɹən/
Etymology From Ancient Greek περί (perí, “around”) + ἄστρον (ástron, “star”).
1
Astronomy, Natural sciences That point of the orbit of a celestial body which is closest to the star around which the body is orbiting.
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.