hear - high
- helical-welded pipe
- heliographic paper
- helium thermometer
- helium-core electrons
- heliwelding
- helmet shield
- help
- helper
- helper roll
- helver
- helvetium
- hematite
- hematite ore
- hematite pig iron
- hematite-magnetite mix
- hemihedral class
- hemimorphic crystal
- hemiplegic structure
- hemming
- hen-and-chickens method
- hepatic cinnabar
- heratol
- Herbert (pendulum) hardness
- Herbert pendulum hardness tester
- Herman process
- Heroult electric arc furnace
- Herreshof furnace
- herringbone brickwork
- herringbone masonry
- herringbone pattern
- heterochromatic radiation
- heterochromatic xeroradiography
- heterogene structure
- heterogeneous alloy
- heterogeneous condition
- heterogeneous light
- heterogeneous mass
- heterogeneous nucleation
- heterogeneous radiation
- heterogeneous xeroradiography