Penannular means in the form of an incomplete circle or ring and may refer to:

• Penannular brooch or Celtic brooch, a type of brooch clothes fasteners, often rather large
  • Pseudo-penannular brooch, a related type that appears to be penannular, with two large terminals, but actually forms a complete circle
• Penannular ring
• Penannular bracelet
• A common form of earthworks; including some ditches around bowl barrows

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