A purposefully designed timing of a series of traffic lights to produce a green light for cars travelling at the correct speed as they arrive at the lights.

plural of green hellebore

An extremely toxic herbaceous perennial plant of the species Veratrum viride that is native to the western and eastern parts of the United States, but not the central part.

(chiefly UK) Having a seemingly natural gardening ability.

An area of natural parkland within an urban region, supposed to replenish the air with oxygen.

plural of green room

A roof of a house or other building which is covered with soil and grass, plants, trees, or other landscaping materials.

plural of green roof

plural of Green Goddess

Chroma key, a technique for replacing the studio background of video. Also called blue screen depending on the color of the background. / The display of an IBM 3270 or similar monochrome monitor.