Cerium is a reactive grey metal and is one of the most abundant of the lanthanide group of metals.
CE mark
A mandatory conformance mark on many products placed on the market in the European Economic Area.
Abbreviation of Common Era.
Chemical formula for Cerium III Oxide.
Chemical formula for Cerium III Chloride.
A durable wood used in ancient buildings. Easy to work and strongly scented.
The overhead upper surface.
Ceiling Attenuation Class
This is a rating value for the efficiency of the ceiling as a barrier to airborne sound transmission.
Ceiling Function
The ceiling function of x is the smallest integer greater than or equal to x.
Ceiling Light
An instrument consisting of a drum and an optical system that projects a narrow vertical beam of light onto a cloud base.
An instrument that is used to measure the angular elevation of a projected light on the base of a cloud.
Celestial Sphere
An imaginary sphere of infinite radius centered on the Earth and poles aligned with the poles of the Earth.
The functional basic unit of life.
Cell Differentiation
Specialization of cell structure and function during embryonic growth and development.
Cell Membrane
The membrane around a cell.
Cell Mismatch
The condition of a battery pack that contains cells with significant variations in voltage or capacity.
Cell Reaction
The overall chemical reaction occurring in the electrochemical cell. It is the sum of the two electrode reactions.
Cell Reversal
Inversion of the polarity of the electrodes of the weakest cells in a battery, usually as a result of overdischarge.
Cell Voltage
The electrical potential difference between the two electrodes of an electrochemical cell.
Cell Wall
A rigid layer surrounding most bacterial cells, plant cells and some protists.
Cellophane is a thin, transparent, waterproof, protective film that is used in many types of packaging.

A polysaccharide made of linked glucose molecules that strengthens the cell walls of most plants.

Cellulose Acetate
Used as a film base in photography, and as a component in some adhesives. It is also used as a synthetic fibre.

Cellulosic Ethanol
Ethanol made from agricultural refuse, grass, wood, municipal waste and a variety of feedstock, which is less expensive and more available than just corn.
Celsius, Anders
Swedish professor of astronomy who devised the Celsius thermometer.
Celsius Temperature Scale
The centigrade scale of temperature was defined as 0°C at the ice point of water and as 100°C at the boiling point of water (at 1 standard atmosphere).
A substance that can be used to build together aggregates of sand or stone into a cohesive structure. May be a single compound or a mixture. May be hydraulic set, air set or chemical set.
Cement Mixtures
Listed as parts Cement to Sand to Aggregate.
Cement Slurry
A thin, watery cement mixture for pumping or for use as a wash over a surface.
The process of spontaneous reduction of the ions of a metal by another metal above it in the electromotive series.
A compound of iron and carbon.
The geological era covering about 65 million years ago to present day.
In musical research, a unit of pitch change equal to 0.01 semitones.
Prefix representing a multiplication of 10-2
The centigrade scale of temperature was defined as 0°C at the ice point of water and as 100°C at the boiling point of water (at 1 standard atmosphere).
Centigrade Heat Unit
The amount of heat necessary to raise one pound weight of water through 1° C.
1 centimetre of mercury.
A number equal to 10303.
The centimetre is a unit of length and is one hundredth of a metre by definition.
Centimetre Gramme Second
A system of units in which the fundamental units are centimetre, gramme and second.
Centimetre of Mercury
A traditional unit of pressure equal to 1.333 22 kilopascal.
Centimetre of Water
A unit of pressure equal to the pressure exerted at the Earth′s surface by a water column 1 centimetre high, approximately 98.067 pascals.
One hundredth of a poise, the CGS derived unit of dynamic viscosity of a fluid.
A cgs unit of kinematic viscosity.
Central Angle
Angle whose vertex is placed at the center of a circle.
Central Atom
In a Lewis structure, usually the atom that is the most electronegative.
Central Limit Theorem
A random sample of observations from any distribution with a finite mean and a finite variance, the average will tend to follow a normal distribution for large samples.
Central Processing Unit
The computer chip primarily responsible for executing instructions.
Central Tendencies
A number which in some way conveys the "centre" or "middle" of a set of data. The most frequently used measures are the mean and the median.
Central Volcano
A volcano constructed by the ejection of debris and lava flows from a central point, forming a more or less symmetrical volcano.
A point or axis around which anything revolves or rotates.
Centre Drill
A combined countersink and drill used to prepare work for mounting centres.
Centre European pour Rechearche Nucleaire
The major European International Accelerator Laboratory located near Geneva, Switzerland.
Centre Feed Method
Connecting the center of an antenna to a transmission line which is then connected to the output stage of the transmitter.
Centre Frequency
Frequency to which an amplifier is tuned. The frequency half way between the cut-off frequencies of a tuned circuit.
Centre of Mass
The balance point of an object. The location in an object that has the same translational motion as the object if it were shrunk to a point.
Centre of Pressure
The point at which the aerodynamic forces on a body appear to act, and at which there is no aerodynamic movement.
Centre Punch
A pointed hand tool made of hardened steel and shaped somewhat like a pencil.
Centre Tap
Midway connection between the two ends of a winding.
Centre Wavelength
For filters and coatings, the average of the wavelength values at the half-power points of the transmission band.
Headstock and tailstock centres used to retain and centre the workpiece in a lathe.
Centrifugal Cutout Switch
A centrifugally operated automatic mechanism used in conjunction with split phase and other types of single-phase induction motors.
Centrifugal Fan
A mechanical device for moving air or gases.
Centrifugal Force
A fictitious force arising in a rotating reference system.
Centrifuge Casting
A casting technique in which the mould is spun and the molten metal is poured in the centre.
An adjective meaning 'centre-fleeing.'
The centre of mass of a figure.
Constricted region of a chromosome which serves as a site for microtubule attachment.
One hundred of something.
Chemical formula for Cerium Oxide.
Cepheid Variable
A type of variable star which exhibits a regular pattern of changing brightness as a function of time.
A cepstrum is a time history defined as the power spectrum of the logarithm of the Power spectrum.
Inorganic, nonmetalllic products for which the interatomic bonding is predominantly ionic.
Ceramic Bearing
Ceramic balls have a higher stiffness, hardness and can operate at a higher temperature.
Ceramic Bearings
Fully ceramic bearings where all parts are made from ceramic and hybrid ceramic bearings where only the balls are ceramic.
Ceramic Capacitor
Generally a single layer capacitor that is flat and has a brown coating, Also have the name monoblock or monolithic in which the capacitor is made even smaller by creating multy-layers and coated in orange or blue paint.
Ceramic Matrix Composite
A composite that uses a ceramic as the matrix phase.
Ceramic Tile
A ceramic surfacing unit, usually relatively thin in relation to facial area, made from clay or a mixture of clay; and other ceramic material.
Cerenkov Radiation
A charged particle emits Cerenkov radiation in a cone around its direction of travel when it travels through any medium faster than the speed of light through that medium.
Ceric Oxide
Another name for Cerium Oxide.
A reactive grey metal and is one of the most abundant of the lanthanide group of metals.
Cerium III Chloride


A white hygroscopic solid; It rapidly absorbs water on exposure to moist air to form a hydrate.

Cerium III Oxide


Gold-yellow coloured oxide of rare earth metal cerium.

Cerium IV Sulphate


Yellow to yellow/orange chemical compound that is a strong oxidizer.

Cerium Oxide


The oxide of the rare earth element cerium. Cerium oxide usually appears as a yellow powder. It is insoluble in water and moderately soluble in strong mineral acids. Used alone or together with other substances as a polishing agent for glass.

A composite material consisting of a combination of ceramic and metallic materials.
The major European International Accelerator Laboratory located near Geneva, Switzerland.
Cerous Chloride
Chemical formula for Cerium III Chloride.
Mineral form of Lead II Carbonate.
Cetane Index
A calculated value, derived from fuel density and volatility, giving a reasonably close approximation to cetane number.
Cetane Number
A percentage indicating the ignition quality of diesel fuels.


An oily hydrocarbon of the ethylene series, obtained from spermaceti.

Cetyl Alcohol


At room temperature, cetyl alcohol takes the form of a waxy white solid or flakes

A line segment extending from a vertex of a triangle to the opposite side.