- groundglass screen
- group
- guard
- guard vessel
- guide pin
- gyrator
- half-element
- halftone block
- Hall magnetometer
- hamiltonian
- Hamiltonian operator
- group index
- guide number
- guided wave
- guides
- gyrating mass
- gyratory vibration
- gyroscopic torque
- hadronic
- Hall field
- Hall resistance
- hammer mechanism
- handtool
- hard light
- hard radiation
- harmonic
- harmonic analyzer
- harmonic vibration
- harmonics
- harness
- hatchettite
- Haidinger fringes
- hairline crack
- half-cell
- handover
- hangover
- hardener
- harmonic analyser
- harmonic series
- harmony
- head wave
- heat forming
- heat fusible
- heat hardening
- heat haze
- heat image
- heat load
- heat rate
- heat reservoir
- heat sensor
- heat spectrum
- heat trap
- heat turbine
- heat-form
- heat-setting
- heat-shrink
- heat-shrinkable
- heater rod
- haze meter
- head piece
- hearing aid
- hearing fatigue
- heart-ware
- heat
- heat capacity
- heat carrying
- heat compensation
- heat conductivity
- heat constant
- heat density
- heat detector
- heat displacement
- heat distortion
- heat drop
- heating
- heating chamber
- heating current
- heating depth
- heating furnace
- heating jacket
- heating mantle
- heating oil
- heating pipe
- heating plant
- heating power
- heating surface
- heating system
- heating tape
- helimagnetism
- Helmholtz coils
- hemiellipsoidal bottom
- hemiprism
- heptatonic scale
- hexachromia
- hexatonic scale
- hertz
- HF spectrum
- hog
- holding beam
- Higgs particle