Synonyms for Orbicular (same or very similar meaning)
WordNet sense 1 (circular or nearly circular):
orbiculateWordNet sense 2 ((botany) of leaf shapes; of leaves having no divisions or subdivisions):
simple, unsubdividedWordNet sense 3 (having the shape of a sphere or ball):
global, globular, spherical, globose, ball-shaped, sphericWordNet sense 4 (having a circular shape):
circularFrom the ODE community, based on WordNetadd/edit