apsis.

Either of the points in an orbit where the orbiting body is nearest to or farthest from its primary.

Use it for

Words that belong together

• line of apsides
• orbital apsis

On the page

The next apsis lay beyond the moon.

The navigator marked both apsides.

Usage notes

Primary category: sci-fi. Forms: Singular apsis; plural apsides. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings.