noun
binary weapon; binary chemical weapon
A chemical weapon in which two relatively non-toxic precursors are mixed to produce a toxic agent, typically inside a munition during flight.
バイナリー兵器は、二つの無害な化学物質を混合して有毒ガスを発生させる。
Binary weapons mix two harmless chemical substances to produce toxic gas.
From English 'binary weapon', where 'binary' refers to the two-component chemical system.