【化】 生石灰

[ noun ]
a caustic substance produced by heating limestone
<noun.substance>

Lime \Lime\, n. [AS. l[=i]m; akin to D. lijm, G. leim, OHG.
l[=i]m, Icel. l[=i]m, Sw. lim, Dan. liim, L. limus mud,
linere to smear, and E. loam. [root]126. Cf. {Loam},
{Liniment}.]
1. Birdlime.

Like the lime
That foolish birds are caught with. --Wordsworth.

2. (Chem.) Oxide of calcium, {CaO}; the white or gray,
caustic substance, usually called {quicklime}, obtained by
calcining limestone or shells, the heat driving off carbon
dioxide and leaving lime. It develops great heat when
treated with water, forming {slaked lime}, and is an
essential ingredient of cement, plastering, mortar, etc.
[1913 Webster +PJC]

Note: Lime is the principal constituent of limestone, marble,
chalk, bones, shells, etc.

{Caustic lime}, Calcium hydroxide or slaked lime; also, in a
less technical sense, calcium oxide or quicklime.

{Lime burner}, one who burns limestone, shells, etc., to make
lime.

{Lime pit}, a limestone quarry.

{Lime rod}, {Lime twig}, a twig smeared with birdlime; hence,
that which catches; a snare. --Chaucer.


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.