Source : Webster's Revised Unabridged Dictionary (1913)

Circinate \Cir"ci*nate\, v. t.
   To make a circle around; to encompass. [Obs.] --Bailey.

Circinate \Cir"ci*nate\, a. [L. circinatus, p. p. of circinare
   to make round, fr. circinus a pair of compasses, from Gr. ? a
   circle.] (Bot.)
   Rolled together downward, the tip occupying the center; -- a
   term used in reference to foliation or leafing, as in ferns.
   --Gray.

Source : WordNet®

circinate
     adj : shaped like a ring [syn: {annular}, {annulate}, {annulated},
            {circular}, {ringed}, {ring-shaped}, {doughnut-shaped}]