under-orbn.
Origin: Formed within English, by derivation. Etymons: under- prefix1, orb n.1
Etymology: < under- prefix1 + orb n.1
the world > the universe > planet > primary planet > secondary planet, satellite > [noun]
1605 J. Sylvester tr. G. de S. Du Bartas i. iv. 126 Th' vnder-Orbes..Each by himselfe an oblique course doth slide.
This entry has not yet been fully updated (first published 1921; most recently modified version published online March 2022).