methanol nets is used as a means of limiting catches.)

mesic adjective referring to an organism growing in or an environment characterised by moderate moisture meso- prefix middle mesobenthos noun the animals or plants living on the seabed, 250-1000m below the surface mesoclimate noun the climate over a specific locality such as a hillside or valley, extending no more than a few kilometres in radius. i> macroclimate, microclimate mesohaline adjective referring to water that contains a limited amount of salt mesopause noun a thin cold layer of the Earth's atmosphere between the mesosphere and the thermosphere mesophyll noun the tissue inside a leaf where photosynthesis takes place mesophyte noun a plant that needs a standard amount of water to survive mesoplankton plural noun organisms that take the form of plankton for part of their life cycle mesosaprobic adjective referring to an organism that can survive in moderately polluted water mesosphere noun the zone of the Earth's atmosphere between the stratosphere and the thermosphere (note: It lies 50-80km above the surface, with the stratopause at the bottom and the mesopause at the top. The air temperature falls steadily with increasing ascent through the mesosphere.)

mesotherm noun a plant that grows in warm conditions mesotrophic adjective referring to water that contains a moderate amount of nutrients. Compare eutrophic, oligotrophic meta- prefix 1. changing 2. following metabolic adjective referring to metabolism metabolise verb to break down or build up organic compounds by metabolism O The liver metabolises proteins and carbohydrates.

metabolism noun the chemical processes of breaking down or building up organic compounds in organisms metabolite noun a chemical produced as a result of metabolism metal noun an element or a compound that can conduct heat and electricity metaldehyde noun a substance used in the form of pellets to kill slugs and snails metalimnion noun the middle layer of water in a lake. Also called thermocline. Compare epilimnion, hypolimnion metallic adjective 1. referring to metal O metallic materials 2. referring to something that is like metal, especially in appearance metamorphic adjective referring to rock that has changed because of external influences such as pressure from other rocks or temperature changes. i> igneous, sedimentary metamorphism noun the process of forming metamorphic rock metamorphose verb 1. (of an animal) to change into another form 2. (of rock) to undergo metamorphism metamorphosis noun a process of change into a different form, especially the change of a larva into an adult insect metapopulation noun a population belonging to a group of populations of the same species that exchange individuals through migration and recolonise sites in which other metapopulations have become extinct meteor noun a solid body that enters the Earth's atmosphere from outer space, usually burning up as it does so meteoric adjective referring to meteors meteorite noun a solid body that falls from outer space onto the Earth's surface meteorological adjective referring to meteorology or to climate meteorologist noun a person who studies, reports and forecasts the weather meteorology noun the scientific study of weather and weather conditions O Terrestrial radiation plays an important part in meteorology.

meter noun 1. a device to measure a physical property such as current, rate of flow or air speed 2. US spelling of metre ■ verb to count or measure with a meter methanation noun the process of converting a mixture into methane. Also called methanisation methane noun a colourless flammable gas produced naturally from rotting organic waste, as in landfill sites or animal excreta. Formula: CH4. (note: It is also found in marshes (marsh gas) and coal mines (firedamp).)

methane converter noun a process that turns into a usable form the gas produced by rotting waste in a landfill site methanol noun an alcohol manufactured from coal, natural gas or waste wood, which is used as a fuel or solvent. Formula:

methylated spirits

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