-orbi-

n. [ L. orbiculus, dim. of orbis orb. ] A small orb, or sphere. [ Obs. ] G. Fletcher. [ 1913 Webster ]

‖n. [ NL. See Orbicle. ] (Zool.) Same as Discina. [ 1913 Webster ]

a. [ L. orbicularis, fr. orbiculus, dim. of orbis orb: cf. F. orbiculaire. ] Resembling or having the form of an orb; spherical; circular; orbiculate. -- Or*bic"u*lar*ly, adv. -- Or*bic"u*lar*ness, n. [ 1913 Webster ]

Orbicular as the disk of a planet. De Quincey. [ 1913 Webster ]

n. That which is orbiculate; especially, a solid the vertical section of which is oval, and the horizontal section circular. [ 1913 Webster ]

{ } a. [ L. orbiculatus. See Orbicular. ] Made, or being, in the form of an orb; having a circular, or nearly circular, or a spheroidal, outline. [ 1913 Webster ]

Orbiculate leaf (Bot.), a leaf whose outline is nearly circular. [ 1913 Webster ]

n. The state or quality of being orbiculate; orbicularness. Dr. H. More. [ 1913 Webster ]

n. [ L. orbita a track or rut made by a wheel, course, circuit, fr. orbis a circle: cf. F. orbite. See 2d Orb. ] 1. (Astron.) The path described by a heavenly body in its periodical revolution around another body; as, the orbit of Jupiter, of the earth, of the moon. [ 1913 Webster ]

2. An orb or ball. [ Rare & Improper ] [ 1913 Webster ]

Roll the lucid orbit of an eye. Young. [ 1913 Webster ]

3. (Anat.) The cavity or socket of the skull in which the eye and its appendages are situated. [ 1913 Webster ]

4. (Zool.) The skin which surrounds the eye of a bird. [ 1913 Webster ]

a. Of or pertaining to an orbit. “Orbital revolution.” J. D. Forbes. [ 1913 Webster ]

Orbital index (Anat.), 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. [ 1913 Webster ]