- bachelorship
- bachyaxial fold
- baciliuria
- bacillary
- bacillemia
- bacilli
- bacillicidal
- bacillicide
- bacilliculture
- bacilliform
- bacilliparous
- bacillogenic
- bacilloscopy
- bacillosis
- bacillus
- bacitracin
- back
- back acting
- back action
- back air
- back angle
- back arch
- back arrow
- back axle
- back azimuth
- back balance
- back bar
- back beam
- back bench
- back bias
- back board
- back bond
- back boxing
- back burning
- back catch
- back center
- back chaining
- back coat
- back conduction
- back contact
- back country
- back coupling
- back curing
- back current
- back dating
- back diffusion
- back digger
- back dike
- back diode
- back discharge
- back door
- back draft
- back echo
- back edge
- back elevation
- back emf
- back entry
- back extrusion
- back fall
- back fat
- back feed
- back filler
- back fillet
- back filling
- back fin
- back flow
- back fold
- back folding
- back freight
- back gap
- back gear
- back gearing
- back gutter
- back guy
- back head
- back hearth
- back hoe
- back hole
- back in
- back indication
- back interest
- back joint
- back kick
- back knee
- back label
- back land
- back lash
- back letter
- back level
- back lining
- back link
- back lintel
- back load
- back loader
- back magnetization
- back margin
- back matter
- back nailing
- back number
- back nut