wiktionary
ref
orb + -ed
etymonline
ref
orbed (adj.)
"having the form of an orb, round circular," 1590s, an adjective in past-participle form from orb (n.). The verb orb is attested from 1640s as "enclose in an orb," 1650s as "make an orb," and 1850 in the intransitive sense of "to become an orb."
