masking
adj : hiding from view; "speeding down the other lane beyond the
masking truck"- T.H.White"; "a masking piece is a flat
or curtain that hides part of the stage from the
audience"
n : the act of concealing the existence of something by
obstructing the view of it; "the cover concealed their
guns from enemy aircraft" [syn: {cover}, {covering}, {screening}]