O&M - Operations and maintenance
Octane Number - A rating of the 'knock' characteristics of motor fuels.
OEM - Original Equipment Manufacturer.
Off Center - Not centered; offset, eccentric, or inaccurate.
Oil Hardening - A process of hardening a ferrous alloy of suitable composition by heating within or above the transformation
range and quenching in oil.
Oil Mist - A means of lubricating by injecting oil into an air stream producing a finely atomized spray.
Oil Whirl/Whip - An unstable free vibration whereby a fluid-film bearing has insufficient unit loading.
Oilstones - Moulded abrasives in various shapes used to hand-sharpen cutting tools.
OLED - Organic Light-Emitting Diode
Olefin - Aliphatic hydrocarbons with one or more double bonds along the chain.
Organic compound - Any compound containing carbon except for the carbonates (carbon dioxide, the carbonates and
bicarbonates), the cyanides, and cyanates.
Original Equipment Manufacturer - Products supplied by the company which first created the product.
Otto Cycle - An idealized reversible cycle of four operations occurring in a perfect four-stroke petrol engine.
Ounce Force - A derived unit of force in the British system of units.
Outer Dead Centre - Also known as bottom dead centre.
Outside Caliper - An instrument used to measure the outer dimension of an object.
Overrun - Often used to describe the condition where rotating machinery is in a coast down condition.
Oxidizing Flame - An oxyacetylene flame in which there is an excess of oxygen.
Oxyacetylene Welding - A welding process in which the required temperature is attained by flames obtained from the
combustion of acetylene with oxygen.
Oxygen Cutting - A process of cutting ferrous metals by means of the chemical action of oxygen on elements in the base
metal at elevated temperatures.
Engineering Glossary, Engineering Dictionary O
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