18-letter words containing o, u
- cassius (longinus) — (Gaius)died 42 b.c.; Rom. general & conspirator against Caesar
- catalogue raisonne — a descriptive catalogue, esp one covering works of art in an exhibition or collection
- catskill mountains — a mountain range in SE New York State: resort. Highest peak: Slide Mountain, 1261 m (4204 ft)
- caucasus mountains — a mountain range in SW Russia, running along the N borders of Georgia and Azerbaijan, between the Black Sea and the Caspian Sea: mostly over 2700 m (9000 ft). Highest peak: Mount Elbrus, 5642 m (18 510 ft)
- cauliflower cheese — a dish of cauliflower with a cheese sauce, eaten hot
- cauliflower fungus — a large edible white to yellowish cauliflowerlike mushroom, Sparassis radicata, widely distributed in North America.
- causa sine qua non — an indispensable condition; requisite.
- cellular automaton — (algorithm, parallel) (CA, plural "- automata") A regular spatial lattice of "cells", each of which can have any one of a finite number of states. The state of all cells in the lattice are updated simultaneously and the state of the entire lattice advances in discrete time steps. The state of each cell in the lattice is updated according to a local rule which may depend on the state of the cell and its neighbors at the previous time step. Each cell in a cellular automaton could be considered to be a finite state machine which takes its neighbours' states as input and outputs its own state. The best known example is J.H. Conway's game of Life.
- cellular telephone — a mobile phone
- centre of pressure — the point in a body at which the resultant pressure acts when the body is immersed in a fluid
- centum call second — (unit) (CCS) A unit used (in North America) to quantify the total traffic running in a network. 1 CCS is 100 call-seconds. That means 1 CCS could be 2 calls of 50 seconds duration or 20 calls of 5 seconds duration.
- charge conjugation — the mathematical operation of replacing every elementary particle by its antiparticle. Symbol: C.
- charge of quarters — a member of the armed forces who handles administration in his or her unit, esp after duty hours
- chartered surveyor — (in Britain) a surveyor who is registered with the Royal Institution of Chartered Surveyors as having the qualifications, training, and experience to satisfy their professional requirements
- chebyshev equation — Tchebycheff equation.
- chinese revolution — the overthrow of the last Manchu emperor and the establishment of a republic in China (1911–12)
- chlorofluorocarbon — Chlorofluorocarbons are the same as CFCs.
- chlorohydroquinone — a white to light-tan, crystalline, water-soluble solid, C 6 H 3 Cl(OH) 2 , used chiefly in organic synthesis and as a developer in photography.
- chocolate-coloured — dark brown
- chuck-will's-widow — a large North American nightjar, Caprimulgus carolinensis, similar to the whippoorwill
- church of scotland — the established church in Scotland, Calvinist in doctrine and Presbyterian in constitution
- circular dichroism — selective absorption of one of the two possible circular polarizations of light.
- circulatory system — the system concerned with the transport of blood and lymph, consisting of the heart, blood vessels, lymph vessels, etc
- circumnavigational — Relating to circumnavigation.
- citizen journalism — the involvement of non-professionals in reporting news, esp in blogs and other websites
- claustrophobically — In a claustrophobic way.
- clean up one's act — to start to behave in a responsible manner
- clew down (or up) — to lower (or raise) a sail by means of clew lines
- closure conversion — (theory) The transformation of continuation passing style code so that the only free variables of functions are names of other functions. See also Lambda lifting.
- coast-guard cutter — a cutter used by the U.S. Coast Guard.
- coastguard station — the headquarters or local offices of a coastguard
- cock-a-leekie soup — a soup made from a fowl boiled with leeks
- coffee-table music — unadventurous music
- coiled tubing unit — A coiled tubing unit is all of the equipment needed to carry out coiled tubing drilling.
- coitus interruptus — the deliberate withdrawal of the penis from the vagina before ejaculation
- college of justice — the official name for the Scottish Court of Session; the supreme court of Scotland
- colloidal solution — a mixture having particles of one component, with diameters between 10 −7 and 10 −9 metres, suspended in a continuous phase of another component. The mixture has properties between those of a solution and a fine suspension
- colossus of rhodes — a giant bronze statue of Apollo built on Rhodes in about 292–280 bc; destroyed by an earthquake in 225 bc; one of the Seven Wonders of the World
- colour commentator — a sports celebrity who works as part of a commentary team
- colour photography — the art or process of taking and developing photographs in colour
- colour temperature — the temperature of a black-body radiator at which it would emit radiation of the same chromaticity as the light under consideration
- combination square — an adjustable device for carpenters, used as a try square, miter square, level, etc.
- combustion chamber — an enclosed space in which combustion takes place, such as the space above the piston in the cylinder head of an internal-combustion engine or the chambers in a gas turbine or rocket engine in which fuel and oxidant burn
- combustion furnace — a furnace used in the laboratory to carry out elemental analysis of organic compounds
- common user access — (programming) (CUA) The user interface standard of SAA.
- common-law husband — a man considered to be a woman's husband after the couple have cohabited for several years
- communication cord — a cord or chain in a train which may be pulled by a passenger to stop the train in an emergency
- communication line — a line carrying communications
- community hospital — (in the US) a local hospital
- community language — a language spoken by members of a minority group or community within a majority language context