noun
Etymology: silver (I)
: a poisonous irritant crystalline soluble salt AgNO 3 obtained by the action of nitric acid on silver that blackens on contact with organic matter, that is used chiefly in making silver halides for photography, in silvering (as glass for mirrors), as a chemical reagent in indelible inks and hair dyes, and in medicine externally as an astringent, antiseptic, and germicide — see lunar caustic