O

O   O3  

Oa

Oak  

Ob

Objective   Oblate Spheroid   Obligate Anaerobes   Oblique Angle   Oblique Coordinates  
Oblique Triangle   Observation   Obsidian   Obtuse Angle   Obtuse Triangle  

Oc

Occams Razor   Occultation   Octadecagon   Octadecanoic Acid   Octagon  
Octahedral Position   Octahedron   Octal   Octane   Octane Number  
Octant   Octave   Octet   Octet Rule   Octillion  
Ocular   Oculogyric   OCV   OD  

Od

Odd Function   Odd Number   OEM  

Oe

Oersted  

of

of the order of   Off Centre   Off Line Test Equipment   Office Noise Index   Offset Binary Coding  
Offset Error   OHC  

Oh

Ohm   Ohm, Georg Simon   Ohmmeter   Ohms per Square   OHV  

Oi

Oil   Oil Canning   Oil Control Ring   Oil Detergent   Oil Groove  
Oil Hardening   Oil Mist   Oil Mist Lubrication   Oil of Bitter Almond   Oil of Mirbane  
Oil of Vitriol   Oil Whirl/Whip   Oilstones  

Ol

Olbers Paradox   Oldham Coupling   Oleoresin   Oligocene   Olive Oil  

om

omega   omicron   Omni   Omnidirectional   Omnidirectional Antenna  

On

On Line Test Equipment   On This Day   One Dimensional   One to One  

Op

Opacity   Opaque   Open Circuit   Open Circuit Voltage   Open Crank Engine  
Open Differential   Open Interval   Open Loop   Open Loop Fuel Control   Open Loop Gain  
OpenGL   Operating Point   Operating Pressure   Operating Stress   Operating System  
Operational Amplifier   Opposed Piston Engine   Opposite Faces   Opposition   Optic Axis  
Optical Activity   Optical Axis   Optical Cavity   Optical Coupler   Optical Encoder  
Optical Filter   Optical Flat   Optical Illusion   Optical Interference   Optical Pumping  
Optical Pyrometer   Optical Transmission   Optics   Optics Calculations   Optics Conversions  
Optics Weblinks   Optimum Working Frequency   Opto-Isolated  

Or

Or Gate   Orbit   Orbit Acquisition   Orbital   Orbital Angular Momentum Quantum Number  
Orbital Equation   Order   Order of Reaction   Order Tracking   Ordered Pair  
Ordered System   Ordering   Ordinal Data   Ordinal Number   Ordinate  
Ordovician   Ore   Organic Chemistry   Organic Compound   Organochromic Indicators  
Orichalchum   Oriented Strand Board   Orifice   Origin   Original Equipment Manufacturer  
Ormolu   Ornithopter   Orthic Triangle   Orthocentre   Orthogonal  
Orthogonal Matrix   Orthophospheric Acid  

Os

Os   Oscillation   Oscillator   Oscilloscope   Osmiridium  
Osmium   Osmometry   Osmosis   Osmotic Pressure  

Ot

Otologist   Otto Cycle  

Ou

Ounce Force   Ounces   Outcome   Outcome Space   Outer Dead Centre  
Outfeed   Outgassing   Outlier   Output   Output Impedance  
Outside Caliper   Outside Diameter  

Ov

Overcast   Overcharge   Overdrive   Overdriven   Overhang Beam  
Overhead Cam   Overhead Valve   Overhung Load   Overload Rating   Overmodulation  
Overrun   Overspeed Protection   Oversteer   Overstressing   Overtone  
Ovum  

Ox

Oxalic Acid   Oxidant   Oxidation   Oxidation Half Reaction   Oxidation Number  
Oxidation Reaction   Oxide   Oxidizing Agent   Oxidizing Flame   Oxyacetylene Welding  
Oxyacid   Oxygen   Oxygen Cutting   Oxygen Sensor   Oxygenated Fuel  

oz

oz   Ozone   Ozone Layer