The Collaborative International Dictionary of English v.0.48:
dark-green \dark-green\ adj. similar to the color of fresh grass. Syn: green, greenish, light-green. [WordNet 1.5]WordNet (r) 3.0 (2006):
dark-green adj 1: of the color between blue and yellow in the color spectrum; similar to the color of fresh grass; "a green tree"; "green fields"; "green paint" [syn: green, greenish, light-green, dark-green]