必需品

Necessary \Nec"es*sa*ry\, n.; pl. {Necessaries}.
1. A thing that is necessary or indispensable to some
purpose; something that one can not do without; a
requisite; an essential; -- used chiefly in the plural;
as, the necessaries of life.

2. A privy; a water-closet.

3. pl. (Law) Such things, in respect to infants, lunatics,
and married women, as are requisite for support suitable
to station.