【化】 苛性钾; 氢氧化钾
【医】 苛性钾, 氢氧化钾

[ noun ]
a potassium compound often used in agriculture and industry
<noun.substance>

Caustic \Caus"tic\, Caustical \Caus"tic*al\, a. [L. caustucs,
Ge. ?, fr. ? to burn. Cf. {Calm}, {Ink}.]
1. Capable of destroying the texture of anything or eating
away its substance by chemical action; burning; corrosive;
searing.

2. Severe; satirical; sharp; as, a caustic remark.

{Caustic curve} (Optics), a curve to which the ray of light,
reflected or refracted by another curve, are tangents, the
reflecting or refracting curve and the luminous point
being in one plane.

{Caustic lime}. See under {Lime}.

{Caustic potash}, {Caustic soda} (Chem.), the solid
hydroxides potash, {KOH}, and soda, {NaOH}, or solutions
of the same.

{Caustic silver}, nitrate of silver, lunar caustic.

{Caustic surface} (Optics), a surface to which rays reflected
or refracted by another surface are tangents. Caustic
curves and surfaces are called catacaustic when formed by
reflection, and diacaustic when formed by refraction.

Syn: Stinging; cutting; pungent; searching.

Potash \Pot"ash`\, n. [Pot + ash.] (Chem.)
(a) The hydroxide of potassium hydrate, a hard white brittle
substance, {KOH}, having strong caustic and alkaline
properties; -- hence called also {caustic potash}.
(b) The impure potassium carbonate obtained by leaching wood
ashes, either as a strong solution (lye), or as a white
crystalline (pearlash).


Potassa \Po*tas"sa\, n. [NL., fr. E. potash.] (Chem.)
(a) Potassium oxide. [Obs.]
(b) Potassium hydroxide, commonly called {caustic potash}.