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Oc- Occams Razor
- The suggestion that the simpler a theory is, the better it is.
- Occultation
- Interruption of the light from an object to an observer when a body in interposed.
- Octadecagon
- An 18 sided polygon.
- Octagon
- A polygon with 8 sides.
- Octahedral Position
- The void space among closed-packed, hard sphere atoms or ions for which there are six nearest neighbours.
- Octahedron
- A polyhedron with 8 faces.
- Octal
- A number system using the base-8, i.e., each digit can be any of 8 values,
represented by the digits 0-7.
- Octane
- Flammable liquid compounds found in petroleum and natural gas.
- Octane Number
- A rating of the 'knock' characteristics of motor fuels.
- Octant
- Any one of the 8 portions of space determined by the 3 coordinate planes.
- Octave
- Two frequencies are an octave apart if the ratio of the higher frequency to the lower frequency is two.
- Octet
- A set of eight valence electrons.
- Octet Rule
- A guideline for building Lewis structures that states that atoms tend to gain, lose, or share valence electrons with other atoms in a molecule until they hold or share eight valence electrons.
- Octillion
- A number equal to 1027.
- Ocular
- Pertaining to or in relation with the eye.
- Oculogyric
- Referring to movements of the eyes.
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