1. Having four sides
   - quadrilateral

See also: many-sided, multilateral

• perpendicularity
• perpendicularly
• perpetrate
• perpetration
• perpetrator
• perpetual
• perpetual calendar
• perpetual motion
• perpetual motion machine
• perpetual warrant
• perpetually
• perpetuate
• perpetuation
• perpetuity
• perphenazine
• perplex
• perplexed
• perplexedly
• perplexing
• perplexity
• perquisite
• perron
• perry
• Perry Mason
• pers