chlorpyrifos noun an organophosphate insecticide used on a wide range of crops chlortoluron noun a herbicide applied as a spray, especially on cereals (note: It is under review for withdrawal from use in the European Union.)

cholera noun a serious bacterial disease spread through food or water which has been infected by Vibrio cholerae O A cholera epidemic broke out after the flood. cholesterol noun a fatty substance found in fats and oils. It is produced by the liver and forms an essential part of cells. CHP plant abbrcombined heat and power plant chrom- prefix same as chromo-chromatography noun a scientific method for separating and analysing chemicals through a porous medium chromatophore noun a plant or animal cell which contains pigment, e.g. a cell in the eyes, hair and skin, or a similar cell in an alga (note: Chromatophores enable chameleons to change colour.) chromium noun a metallic trace element. It is used to make alloys. (note: The chemical symbol is Cr; the atomic number is 24 and the atomic weight is 52.00.) chromo- prefix 1. colour 2. chromium chromosomal adjective referring to chromosomes chromosome noun a thin structure in the nucleus of a cell, formed of DNA which carries the genes (note: Different types of organism have different numbers of chromosomes.)

chromosome number noun the number of chromosomes present in each cell nucleus of a specific animal or plant (note: Each species has its own characteristic chromosome number, e.g. humans have 46 chromosomes, receiving 23 from each parent.)

chronic exposure noun exposure to a pollutant or radioactive substance for a long period, even for a whole lifetime chronobiology noun the study of recurring cycles of events in the natural world chrysalis noun 1. a stage in the development of a butterfly or moth when the pupa is protected in a hard case 2. the hard case in which a pupa is protected Chrysophyta noun a group of golden-brown algae, which store oil in their cell walls chute noun 1. a sloping channel along which something such as water or rubbish may pass 2. a waterfall

CID abbr cattle identification document -cide suffix killing cilia plural of cilium ciliary adjective referring to cilia ciliate, ciliated adjective having cilia cilium noun one of many tiny projections resembling hairs which move backwards and forwards and drive particles or fluid along (note: The plural is cilia.) cinders plural noun 1. hard pieces of material left when the flames from a burning substance have gone out 2. the small pieces of lava and rock thrown up in a volcanic eruption circadian rhythm noun a rhythm of daily activities in plants and animals, repeating every twenty-four hours circuit breaker noun an electrical device used to interrupt an electrical supply when there is too much current flow circulate verb to move round in such a way as to arrive at the point of departure O Water circulates via the radiator and pump through to the engine block itself. circulation noun the act of moving round in such a way as to arrive at the point of departure O the circulation of the blood O The general circulation is indicated by the arrows.

circulatory adjective referring to circulation circum- prefix around circumpolar adjective around the North or South Pole circumpolar vortex noun a circular movement of air around the North or South Pole. Also called polar vortex cirque noun a hollow formed in mountains or high plateaux by small, separate glaciers. Also called corrie, cwm cirrocumulus noun a form of high cloud, occurring above 5000 m, like altocumulus with little clouds cirrostratus noun a high thin layer of cloud cirrus noun a high cloud, occurring above 5000m, forming a mass of separate clouds which look as if they are made of fibres, but which are formed of ice crystals CITES abbr Convention on International Trade in Endangered Species of Wild Fauna and Flora citric acid noun an acid found in fruit such as oranges, lemons and grapefruit citric acid cycle noun same as Krebs cycle

Cl symbol chlorine

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