Webster’s Revised Unabridged Dictionary · 1913
Orbiculate
Or·bic′u·late (·lāt), n. That which is orbiculate; especially, a solid the vertical section of which is oval, and the horizontal section circular.
Or·bic′u·late, Or·bic′u·la′ted, a. [L. orbiculatus. See Orbicular.] Made, or being, in the form of an orb; having a circular, or nearly circular, or a spheroidal, outline.
Orbiculate leaf (Bot.), a leaf whose outline is nearly circular.