From The Collaborative International Dictionary of English v.0.48 [gcide]:
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).
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Potassa \Po*tas"sa\, n. [NL., fr. E. potash.] (Chem.)
(a) Potassium oxide. [Obs.]
(b) Potassium hydroxide, commonly called {caustic potash}.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
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.
[1913 Webster]
2. Severe; satirical; sharp; as, a caustic remark.
[1913 Webster]
{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.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
caustic potash
n 1: a potassium compound often used in agriculture and industry
[syn: {potash}, {caustic potash}, {potassium hydroxide}]
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