(1):

(a.) A bastion of a circular form.

(2):

(a.) A rondelay.

(3):

(a.) Anything having a round form; a round figure; a circle.

(4):

(a.) A small circular shield, sometimes not more than a foot in diameter, used by soldiers in the fourteenth and fifteenth centuries.

(5):

(a.) A circular spot; a sharge in the form of a small circle.