1. Of or relating to or shaped like a pentagon
   - pentagonal

See also: pentagon

• Proteus anguinus
• prothalamion
• prothalamium
• prothallus
• prothesis
• prothetic
• prothonotary
• prothorax
• prothrombin
• prothrombin accelerator
• prothrombinase
• protirelin
• protist
• Protista
• protistan
• Protium
• Protium guianense
• Protium heptaphyllum
• proto
• Proto-Indo European
• Proto-Norse
• proto-oncogene
• protoactinium
• protoanthropology
• protoarchaeology