grou - high
- HEO-to-LEO transfer
- HEP
- HEPA filter
- heptadioic acid
- heptagon
- heptahedron
- heptanal
- heptane
- heptode
- Herakles stitch
- herbicide
- heredity
- heridability
- heritage
- herkolite
- hermaphrodite caliper
- hermaphroditic contact
- hermetic
- hermetic centrifugal air cooler
- hermetic compressor
- hermetic connector
- hermetic cooler
- hermetic encapsulation
- hermetic enclosure
- hermetic housing
- hermetic refrigerator
- hermetic seal
- hermetic tanker loading
- hermetically sealed capacitor
- hermetically sealed hatch
- hermetically sealed optron
- hermetically sealed relay
- hermetically sealed resistor
- hermeticity test
- Hermitian form
- Hermitian matrix
- hermiticity
- Heroult electric arc furnace
- herring-bone gear
- herring-bone gearing