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[Mod. Latin, dim in. from orb is.] [ORB (1).] Bot.: The scutellum of the lichen a ceo us genus Usnea. or-bis, s. [Lat. a circle.] Ichthy.: Chœtodon orb is, a fish without scales, but with a prickly skin. It inhabits the Incian seas, and is unfit for food. or'-bit, s . [Lat. orbita =a track, a course, from orb is an orb (q. v.); Fr. orbite ; Ital. & Sp. orbita .] I. Ordinary Language : 1. In the same sense as II. 2. "In such a manner that the planets revolve in orbits almost circular." -Maclaurin : Sir I. Newton , bk. iv., ch. i. 2. A small orb. "Roll the lucid orbit of an eye." Young: Satires, v. 7. II. Technically : 1. Anat .: The bony cavity in which the eye is situated. 2. Astron.: The path of a primary planet in its revolution round the sun, or of a secondary one in its revolution round the primary. 3. Ornith.: The skin which surrounds the eye of a bird. or-bit-al, *or-bit-u-al, adj. [Eng. orbit; -al, -ual.] Pertaining to an orbit. There are orbital bones and foramina, also an orbital arch, nerve, plate of ethmoid bone, and proce of palate bone. *or-bit-ar, a. [Eng. orbit ; -ar.] The same as ORBITAL (q. v.).