Possible Clues:

• Nipple ring (Var.)
• Down which East End scamperer descends to form area for growth?
• Ring of anatomy
• Biological ring
• Small cavity, as around a cactus spine
• Prickly area of a prickly pear
• Part of the iris surrounding the pupil (Var.)
• Space on a butterfly's wing
• Colored ring
• Botanical ring