connected with the orbit of a planet or object in space （行星或空间物体）轨道的 - (British English)
(of a road 道路 built around the edge of a town or city to reduce the amount of traffic travelling through the centre （城市）外环路的
Word Originmid 16th cent. (referring to the eye socket): probably from medieval Latin orbitalis, from Latin orbita ‘course, track’ (in medieval Latin ‘eye socket’), feminine of orbitus ‘circular’, from orbis ‘ring’.