slaked lime


a soft, white, crystalline, very slightly water-soluble powder, Ca(OH)2, obtained by the action of water on lime: used chiefly in mortars, plasters, and cements.

Words nearby slaked lime

Origin of slaked lime

First recorded in 1605–15
Also called calcium hydroxide, calcium hydrate, hydrated lime, lime hydrate.

Definition for hydrated lime (2 of 2)

[ lahym ]
/ laɪm /


Also called burnt lime, calcium oxide, caustic lime, calx, quicklime. a white or grayish-white, odorless, lumpy, very slightly water-soluble solid, CaO, that when combined with water forms calcium hydroxide (slaked lime), obtained from calcium carbonate, limestone, or oyster shells: used chiefly in mortars, plasters, and cements, in bleaching powder, and in the manufacture of steel, paper, glass, and various chemicals of calcium.
a calcium compound for improving crops grown in soils deficient in lime.

verb (used with object), limed, lim·ing.

Origin of lime

before 900; Middle English, Old English līm; cognate with Dutch lijm, German Leim, Old Norse līm glue, Latin līmus slime; akin to loam


lime·less, adjectivelime·like, adjectiveun·limed, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for hydrated lime (1 of 5)

/ (laɪm) /


agriculture any of certain calcium compounds, esp calcium hydroxide, spread as a dressing on lime-deficient land

verb (tr)

to spread (twigs, etc) with birdlime
to spread a calcium compound upon (land) to improve plant growth
to catch (animals, esp birds) with or as if with birdlime
to whitewash or cover (a wall, ceiling, etc) with a mixture of lime and water (limewash)

Word Origin for lime

Old English līm; related to Icelandic līm glue, Latin līmus slime

British Dictionary definitions for hydrated lime (2 of 5)

/ (laɪm) /


a small Asian citrus tree, Citrus aurantifolia, with stiff sharp spines and small round or oval greenish fruits
  1. the fruit of this tree, having acid fleshy pulp rich in vitamin C
  2. (as modifier)lime juice


having the flavour of lime fruit

Word Origin for lime

C17: from French, from Provençal, from Arabic līmah

British Dictionary definitions for hydrated lime (3 of 5)

/ (laɪm) /


any linden tree, such as Tilia europaea, planted in many varieties for ornament

Word Origin for lime

C17: changed from obsolete line, from Old English lind linden

British Dictionary definitions for hydrated lime (4 of 5)

/ (laɪm) /


(intr) Caribbean slang (of young people) to sit or stand around on the pavement

Word Origin for lime

of unknown origin

British Dictionary definitions for hydrated lime (5 of 5)

slaked lime


another name for calcium hydroxide, esp when made by adding water to calcium oxide
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for hydrated lime

[ līm ]

A white, lumpy, caustic powder made of calcium oxide sometimes mixed with other chemicals. It is made industrially by heating limestone, bones, or shells. Lime is used as an industrial alkali, in waste treatment, and in making glass, paper, steel, insecticides, and building plaster. It is also added to soil to lower its acidity.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.