grav - heat
- half-life period
- half-mutant
- half-normal
- half-period
- half-reflecting mirror
- half-shade
- half-shade polarimeter
- half-thickness layer
- half-time exchange
- half-tone image
- half-transmitting mirror
- half-value layer
- half-wave
- half-wave detection
- half-wave dipole
- half-wave douplet
- half-wave layer
- half-wave length
- half-wave plate
- half-way unit
