1. Shaped like a ring
   - annular, annulated, circinate, ringed, ring-shaped, doughnut-shaped

See also: rounded

• heads-up display
• headsail
• headscarf
• headset
• headshake
• headshaking
• headship
• headshot
• headsman
• headspace
• headspring
• headstall
• headstand
• headstock
• headstone
• headstream
• headstrong
• headwaiter
• headwater
• headway
• headwind
• headword
• headwork
• heady
• heal