The Collaborative International Dictionary of English v.0.48:
Greenish \Green"ish\, a. Somewhat green; having a tinge of green; as, a greenish yellow. -- Green"ish*ness, n. [1913 Webster]WordNet (r) 3.0 (2006):
greenish 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]