hollow concrete block
hollow masonry unit
- perigastritis
- perigeal
- perigean
- perigean range
- perigean tidal currents
- perigean tide
- perigean tides
- perigee
- perigee altitude
- perigee argument
- perigee kick motor
- perigee motor firing
- perigees
- perigee-to-perigee period
- perigemmal
- perigenesis
- perigenetic
- perigenic
- perigenous
- perigeum
- periglacial
- periglacial climate
- periglacial lake
- periglacial process
- periglandulitis