S: (n) screen, cover, covert, concealment (a covering that serves to conceal or shelter something) "a screen of trees afforded privacy"; "under cover of darkness"; "the brush provided a covert for game"; "the simplest concealment is to match perfectly the color of the background"
Adjective
S: (adj) covert (secret or hidden; not openly practiced or engaged in or shown or avowed) "covert actions by the CIA"; "covert funding for the rebels"
S: (adj) covert ((of a wife) being under the protection of her husband) "a woman covert"