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From The Collaborative International Dictionary of English v.0.48:
Orbiculate \Or*bic"u*late\, Orbiculated \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. [1913 Webster] Orbiculate leaf (Bot.), a leaf whose outline is nearly circular. [1913 Webster]