#ring-shaped

• Fused — Pertaining to structures, chemical molecules, or organisms that are ring-shaped, composed of cyclic rings, or feature fused molecular rings sharing common atoms. In organic chemistry, it describes fused polycyclic hydrocarbon compounds, while in zoology it historically references ring-segmented organisms (annelids).
• Areoliform — Having the shape of an areola; an anatomical, dermatological, or botanical structure configured in the form of a small circle, a colored ring, or a distinct circular zone. In medicine, it describes cutaneous lesions or inflammatory spots arranged concentrically around a central point, while in botany it refers to round spots or specific markings on the surface of plant organs.