- background sound
- background subtraction
- background task
- background tasks
- background vorticity
- backhand
- backhand welding
- backhanded
- backhander
- backhaul
- backhoe
- backhouse
- backing
- backing away
- backing bar
- backing bead
- backing bevel
- backing board
- backing coat
- backing course
- backing drum
- backing fabric
- backing flange
- backing light
- backing memory
- backing metal
- backing mill
- backing out
- backing paper
- backing piece
- backing plate
- backing pump
- backing ring
- backing sand
- backing sheet
- backing signal
- backing storage
- backing store
- backing strap
- backing strip
- backing tape
- backing up
- backing wire
- backing-off
- backings
- backjoint
- backlash
- backlash-free
- backless
- backlight
- backlighted photo
- backlighting
- backlist
- backlit
- backlit display
- backlog
- backlog demand
- backlog depreciation
- backlog maintenance
- backmost
- backout
- backpack
- backpacker
- backplane
- backplastering
- backplate
- backpressure
- backpropping
- backrest
- backroad
- backrolling
- backroom boy
- backroom boys
- backroom stock
- backsaw
- backscatter
- backscatter distance
- backscatter effect
- backscatter error
- backscatter peak
- backscattered
- backscattered ion
- backscatterer
- backscattering
- backscattering angle
- backscattering coefficient
- backscattering technique
- backscratcher
- backscrolling
- backset
- backshoe shovel
- backside
- backsight
- backsight method
- backslash
- backslash character
- backslash key
- backslide
- backslider
- backsliding