#film a thin coating or layer; "the table was covered with a film of dust"
supertype: physical_object__object a tangible and visible entity; an entity that can cast a shadow; "it was full of rackets, balls and other objects"
subtype: oil_slick__oilslick a film of oil floating on top of water (especially crude oil spilled from a ship)
subtype: scum a film of impurities or vegetation that can form on the surface of a liquid
subtype: slag__scoria__dross__dros the scum formed by oxidation at the surface of molten metals
subtype: basic_slag__basicslag slag produced in making steel; low in silica but having large amounts of calcium phosphate; useful as fertilizer
subtype: soap_film a film left on objects after they have been washed in soap
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