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n.
the extended two-dimensional outer boundary of a three-dimensional object; "they skimmed over the surface of the water"; "a brush small enough to clean every dental surface"; "the sun has no distinct surface"
n.
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"
n.
(botany) the usually underground organ that lacks buds or leaves or nodes; absorbs water and mineral salts; usually it anchors the plant to the ground