(note: The guard cells and pore are called a stoma, and are most common on the underside of leaves.)

guerrilla noun a plant species that invades a community as isolated individuals. Compare phalanx guideline noun a piece of advice that suggests the best way for something to be done O guidelines for the conduct of experiments guild noun a group of plants or animals of different species which live in the same type of environment gulf noun a very large area of sea enclosed partly by land

Gulf Stream noun a current of warm water in the Atlantic Ocean, which flows north along the east coast of the USA, then crosses the Atlantic to northern Europe, passing close to the west coast of Scotland and giving the British Isles and European coast a mild winter climate compared with countries at the same latitude such as eastern Canada gulfweed noun floating seaweed that grows in the Sargasso Sea gull noun a seabird, with a large body, usually white or grey feathers, a hooked beak and webbed feet. There are several different species.

gully noun 1. a deep channel formed by soil erosion and unable to be filled in by cultivation 2. a small channel for water, e.g. an artificial channel dug at the edge of a field or a natural channel in rock gully cleaning noun the clearance of rubbish from drainage gullies at the edge of roads gum noun a liquid substance in the trunks and branches of some trees, which hardens on contact with air. It is used in confectionery, pharmacy and stationery. gust noun a strong sudden rush of wind O Strong gusts blew dust off the fields into the air.

gusty adjective referring to wind blowing in sudden strong bursts

GW, gW abbr gigawatt

GWh abbr gigawatt-hour

GWP abbr global warming potential

Gy abbr gray gymnosperm noun a seed-bearing plant in which the seeds are carried naked on the scales of a cone rather than being inside a fruit, e.g. a conifer, cycad or ginkgo. i> an-giosperm gynoecium noun the female sex organs (carpels) of a plant gyre noun a circular or spiral motion of ocean water

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