- overvibrate
- overvibration
- overwrite
- ovolo
- owner
- oxidation capacity
- oxidation ditch
- oxidation lagoon
- oxidation pond
- oxidation tower
- oxidizing degradation
- oxyacetylene torch
- oxyacetylene welding
- oxyarc
- oxychloride cement
- oxygen aeration
- oxygen blast
- oxygen cutting
- oxygen cylinder
- oxygen deficit
- pack-harden
- packing block
- packing brick
- packing place
- packing ring
- packsand
- pad
- pad foundation
- paddle agitator
- paddle mixer
- paddle shaft
- paddock
- padmounted substation
- page border
- paginate
- paginating document
- pagoda
- paimtop computer
- paint brush
- paint composition
- paint defect
- paint glass
- paint grinder
- paint mill
- paint pot
- paint rock
- paint roller
- painting brush
- painting device
- painting sketch
- painting workshop
- pair observation
- pair pilaster
- paired
- paired pilasters
- palace
- palaeogenic period
- palaestra
- palatial
- palatial architecture
- pale
- palette
- palisade
- pall
- palladian
- Palladian window
- pallet
- palmtop
- paludal
- pamphlet
- pan tile
- output transformer
- output valve
- outputs
- outrigger abutment
- outrigger shore
- outshot
- outside casing
- outside diameter
- outside scaffolding
- outside slope
- outside storage
- outside wall
- oval arch
- oval knob
- ovendry aggregate
- over-curiosity
- over-decorated
- overabundant
- overall dimension
- overestimate
- overexpenditure
- overfall
- overfall gap
- overfault
- overfire blast
- overflashing
- overflow
- overflow buttress
- overflow chamber