a. 圆的, 环状的, 完整的, 球形的

[医] 环状的, 轮匝状的

Orbicular \Or*bic"u*lar\, 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.

Orbicular as the disk of a planet. --De Quincey.