Lime \Lime\, n. [AS. l[imac]m; akin to D. lijm, G. leim, OHG.
l[imac]m, Icel. l[imac]m, Sw. lim, Dan. liim, L. limus mud,
linere to smear, and E. loam. [root]126. Cf. Loam,
Liniment.]
1. Birdlime.
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Like the lime
That foolish birds are caught with. --Wordsworth.
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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.
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Note: Lime is the principal constituent of limestone, marble,
chalk, bones, shells, etc.
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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.
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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.
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2. Severe; satirical; sharp; as, a caustic remark.
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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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