{ } 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 ]
Whilst this articulation is attested in the Indo-European descendants as a purely paralinguistic form it is phonemic in the ancestral form dating back five millennia or more.