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- ondograph
- ondometer
- Ondo State
- Ondrejov Astrophysical Observatory
- onductors&wires of overhead transmission line
- onduloid
- on duty arrangement of hydropower station
- one-act play
- One and Eight
- one and only one
- one-armed antibody
- one-armed router
- One-Armed Swordsman
- one-aside network
- one atom at a time chemistry
- one-atom-at-a-time chemistry
- one bath dyeing process
- one bath two steps dyeing
- one-bill coverage system
- one boat purse seine fishing
- one-boat seining with bagnet
- one-boson exchange potential
- one-boson exchange potential, OBEP
- one-button alarming commanding system
- one carbon unit