stable population noun a population which remains at a constant level because births and deaths are equal stack noun 1. a very tall industrial chimney, usually containing several flues O The use of high stacks in power stations means that pollution is now more widely spread. 2. a steep-sided pillar of rock which stands in the sea near a cliff 3. a large neat pile of things O a stack of boxes ■ verb to place things in a neat pile one on top of the other stain noun 1. a coloured mark on a surface 2. a substance used to increase contrast in the colour of something such as a piece of tissue or a bacterial sample before examining it under a microscope ■ verb to treat something such as a piece of tissue or a bacterial sample with a dye so as to increase contrast in the colour before examining it under a microscope stakeholder noun a person who has an interest in seeing that something does or does not happen, e.g. a shareholder in a business, an employee or a supplier stalactite noun a long pointed growth of mineral from the ceiling of a cave, formed by the constant dripping of water which is rich in minerals stalagmite noun a long pointed growth of mineral upwards from the floor of a cave, formed by the constant dripping of water which is rich in minerals from the tip of a stalactite stalk noun 1. the main stem of a plant which holds the plant upright 2. a subsidiary stem of a plant, branching out from the main stem or attaching a leaf, flower or fruit stamen noun a male part of a flower consisting of a stalk (filament) bearing a container (anther) in which pollen is produced stand noun a group of plants or trees growing together O a stand of conifers standard noun 1. something which has been agreed on and is used to measure other things by O set higher standards for water purity 2. a plant grown on a single long stem that is kept from forming branches except at the top 3. a large tree in a woodland O a coppice with standards standing crop noun 1. a crop such as wheat which is still growing in a field 2. the numbers and weight of the living vegetation of an area, calculated by weighing the vegetation growing in a sample section staphylococcal adjective caused by sta-phylococci staphylococcus noun a bacterium that causes boils and food poisoning. Genus: Staphylococcus. (note: The plural is staphylococci.)

staple commodity noun a basic food or raw material starch noun a substance composed of chains of glucose units, found in green plants (note: It is the usual form in which carbohydrates exist in food, especially in bread, rice and potatoes, and is broken down by the digestive process into forms of sugar.)

starchy adjective containing a lot of starch O Potatoes are a starchy food. starfish noun one of a group of flat sea animals that have five arms branching from a central body starvation noun the state of having very little or no food starve verb to have little or no food or nourishment stasis noun a state when there is no change, growth or movement static adjective not changing, moving or growing station noun a building used for a particular purpose, e.g. a research station or railway station statistics plural noun figures relating to measurements taken from samples O Population statistics show that the birth rate is slowing down.

stator noun a fixed part of a rotary machine O The low pressure compressor has large rotor blades and stator blades. steady state noun a situation where the input, output and properties of a system remain constant over time steam noun vapour that comes off boiling water and condenses in the atmosphere stearic acid noun a colourless insoluble fatty acid found in animal and vegetable fats. It is used for making candles and soap. Formula: C18H36O3.

steel noun an alloy mainly of iron and carbon steelworks noun a factory where steel is produced from iron ore stele noun the core of roots and stems, consisting of vascular tissue arranged in different patterns in different types of plant stem noun 1. the main stalk of a plant that holds it upright 2. a subsidiary plant stalk, branching out from the main stalk or attaching a leaf, flower or fruit steno- prefix narrow or constricted stenohaline

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