D defs.my
Entry 1 sense Webster, 1913

Orbital

/ôr'-bət-əl/ · Or·bit·al · IPA /ɔɹ.bət.l̩/
01 a. Of or pertaining to an orbit.
  1. 1.
    Of or pertaining to an orbit.
Phrases & compounds
Orbital index — in the skull, the ratio of the vertical height to the transverse width of the orbit, which is taken as the standard, equal to 100.