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greenhorn a youthful or inexperienced person. [2 definitions]
greenhouse a building or enclosure, usu. having a glass roof and walls, for growing and tending plants in a controlled atmosphere.
greenhouse effect the warming trend on the surface and in the lower atmosphere of a planet, held by scientists to occur when solar radiation is trapped, as by emissions from the planet.
greenhouse gas any atmospheric gas that absorbs and emits radiant energy and contributes to the greenhouse effect.
greening any of various types of apple whose skin remains green when the fruit is ripe.
Greenland the largest island in the world, a self-governing possession of Denmark between Iceland and the northeastern coastal islands of Canada.
green light the green-colored light that signifies that oncoming traffic has the right of way. [2 definitions]
green mold any of various fungi whose spores are greenish.
green monkey any of several small, ground-dwelling West African monkeys whose gray hair has a greenish tinge.
green onion a variety of onion that is picked while very young, has a long green stem, and is often eaten raw; scallion.
green pepper the fruit of the bell or sweet pepper before it turns red. [2 definitions]
greenroom a lounge or waiting room provided in some theaters and concert halls for actors or musicians when they are offstage.
greens fee the charge for playing on a golf course.
green snake any of several small greenish nonpoisonous North American snakes.
green-stick fracture a type of fracture to which children are esp. vulnerable, in which a long bone breaks only partway through.
greensward turf on which green grass is growing.
green tea tea made from leaves that were not allowed to ferment before being heated.
green thumb an ability to make plants grow and prosper.
green turtle a large marine turtle, common in warmer waters, whose flesh is often used to make turtle soup or other dishes.
Greenwich a borough of London, England, through which the prime meridian passes.
Greenwich time the solar time that is determined at the prime meridian through Greenwich, England, and that is used to calculate and regulate time throughout most of the world; Greenwich mean time.