hoop - hydr
- hoop
- hoop foil
- hoop head
- hoop pin
- hoop stress
- hooped
- hooping
- hooter
- hop-up
- hopped-up
- hopper barge
- hopper dredge
- hopper-type hold
- horary
- horary angle
- horizon
- horizon distance
- horizon filter
- horizon glass
- horizon glass (of sextant)
- horizon line
- horizon mirror
- horizon shade
- horizon system of coordinates
- horizontal
- horizontal axis
- horizontal bands
- horizontal boring machine
- horizontal broaching machine
- horizontal circle
- horizontal control
- horizontal cut
- horizontal datum
- horizontal fin
- horizontal gradient
- horizontal intensity
- horizontal joint
- horizontal lead
- horizontal limb
- horizontal loading
