More examples. 1  The police have called off the search for the missing child until dawn tomorrow. 2  The missing letter eventually turned up inside a book. 3  A search party was sent out to look for the missing climbers. 4  All of the ship's crew are missing, believed dead. 5  This jigsaw puzzle has two pieces missing.
A highly concentrated source of boric oxide for glazes. Anhydrous borax is made by burning or fusing hydrated borax. It thus contains little or no water of crystallization (conversation ratio of .53 compared to hydrated decahydrate borax) and does not rehydrate under normal storage conditions. Anhydrous borax is water soluble, but considerably less so than raw borax (in aqueous solution it can provide slow release of boron).
Borax is a name for several different but similar chemical compounds, of which probably the commonest is sodium decahydrate or sodium borate. They all contain sodium and boron. Borax is toxic enough to kill ants, fleas and cockroaches and other unwanted insect life. Its effects upon the environment are not yet well documented but it can be toxic to aquatic life if too concentrated. It is regarded by the Australian government as a low threat to the environment but a moderate threat to health.