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koh |
2 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: 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). From Webster's Revised Unabridged Dictionary (1913) [web1913]: 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.
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