- pericyte
- periderm
- peri-distance
- peridium
- peridotite
- perielectrotonus
- perienchyma
- periesophageal space
- periferal water flooding
- perifocus
- perifovea
- perigalactic distance
- perigalacticon
- perigalactic passage
- perigalacticum
- perigeal tide
- perigean
- perigean tide
- perigee
- perigee distance
- perigee kick
- periglacial landform
- periglomerular cell
- perigon
- perigon angle