door.
closure /kl.υ./ noun the act of clos-ing or shutting . The voltage regulator is turned on by the closure of the gener-ator control relay.
cloud /klaυd/ noun a mass of water vapour or ice particles in the sky that can produce rain
COMMENT: The most important types of cloud are the following: altocumulus, cloud formed at about 12,000 feet as a layer of rounded mass with a level base; altostratus, cloud formed as a continuous layer between 6,000 and 20,000 feet usually allowing the sun or moon to be seen from the surface; cirrocumulus, a layer of broken cloud at about 20,000 feet; cirrostratus, layer cloud at about 20,000 feet; cirrus, cloud made of ice crystals at 25,000 – 40,000 feet appearing as hair-like formations; cumulonimbus, cloud formed as a towering mass and often associated with thunderstorms; cumulus, cloud formed in rounded masses with a flat base at low altitude, resulting from up currents of air; nimbostratus, thick dark layer cloud at low altitude from which rain or snow often falls (nimbus = rain cloud); stratocirrus, cloud similar to cirrostratus but more compact; stratocumulus, a layer of connected small clouds at low altitude.
cloud base /klaυd be.s/ noun the
bottom part of a layer of cloud . In gen-eral, the lower the cloud base, the less heat is lost by the earth.
cloud ceiling /klaυd sil../ noun
the height above the ground or water of the base of the lowest layer of cloud
cloud group /klaυd rup/ noun a
collection of different cloud types which have similarities, e.g. stratus clouds
cm abbreviation centimetre co-/k.υ/ prefix together . co-axial
having the same axis . co-located hav-ing the same location coalesce /k.υ.les/ verb to join
together to form a large mass or number
. The moisture in the air coalesces into large water droplets.
coalescence /k.υ.les(.)ns/ noun
the act of joining together to form a larger mass or number . Coalescence of water vapour in the atmosphere forms larger droplets of water.
coast /k.υst/ noun an area where the land meets the sea . Valentia is situated on the coast of south west Ireland.
coastal /k.υst(.)l/ adjective refer-ring to the coast . coastal area an area near a coast . Land and sea breezes occur in coastal areas.
coastal refraction /k.υst(.)l r. frk..n/ noun change in direction of waves when a signal crosses a coastline from sea to land
coastline /k.υstla.n/ noun the out-line of a coast seen from a distance or
47 collapse
on a map . It is normally easy to iden-tify a coastline or island.
coat /k.υt/ noun a thin covering of a substance such as paint . The coats of paint on a large aircraft significantly increase its weight. . verb to cover with a thin layer of a substance such as paint
. Metals are coated for protection against corrosion.
coating /k.υt../ noun 1. a thin layer of a substance . There are two coatings on the inside of CRT screens. 2. the act of covering with a thin layer of a sub-stance
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