plural of blue-green alga

Any member of the taxonomic class or phylum Cyanobacteria; a primitive photosynthetic organism similar to bacteria which is thought to have generated the first oxygen in the Earth's atmosphere.

plural of little green man

a particular species of green insect in the order Neuroptera, Chrysoperla carnea / a member of the genus Chrysoperla in general (the common green lacewing genus)

(sports) A form of bowls, played on a slightly humped, square, grass green, in which two players each play two biased bowls, either along the edges, or diagonally over the crown; it is especially popular in the north of England

An endangered parrot, Ara ambiguus, found in Central America.

(chiefly science fiction) A conventional fictional alien from outer space in the form of a small humanoid with green skin. / (humorous) One of the supposed extraterrestrial occupants of UFOs.

(idiomatic) Ill or unwell, especially as indicated by one's appearance.

Chelonia mydas, a large sea turtle, the only species of the genus Chelonia.

(colloquial, usually with the) Envy, jealousy, covetousness.