paving slab - pile ring
- perennial freezing
- perennial icing
- perennial stream
- perennial yield
- perennially frozen ground
- perfect combustion
- perfect discharge bucket elevator
- perfect elasticity
- perfect jump
- perfect overfall
- perfect plasticity
- perfect shell
- perfect square
- perfect weir
- perfect well
- perfecting
- perfection
- perfection of architectural design
- perfectly elastic
- perflation
- perforate
- perforated
- perforated air duct
- perforated asbestos finishing felt
- perforated breakwater
- perforated brick
- perforated ceiling
- perforated ceiling board
- perforated deck panel
- perforated grille
- perforated gypsum plasterboard
- perforated lath
- perforated metal screen
- perforated panel
- perforated pipe
- perforated plate
- perforated roller
- perforated rolls
- perforated sheet
- perforated sheet lath