lac


Also found in: Dictionary, Thesaurus, Medical, Acronyms, Wikipedia.

lac,

resinous exudation from the bodies of females of a species of scale insect (Tachardia lacca), from which shellacshellac,
solution of lac in alcohol or acetone. In commerce the name is applied to the resinous substance (lac) itself rather than to the solution. It ranges in color from orange to light yellow depending upon the extent to which it has been purified; the darker shellacs are the
..... Click the link for more information.
 is prepared. India is the chief source of shellac, although some is obtained from other areas in Southeast Asia. The insects feed on the sap of the twigs of certain tropical trees, some of which are cultivated for this purpose. The resinous secretion hardens upon exposure to air and forms a protective incrustation around the female and young, which are thus held fast to the twigs. The twigs are scraped to remove the incrustation; this crude lac material is known as stick lac. If the stick lac is crushed, the wood splinters and other foreign materials removed, and the red coloring matter produced by the insects dissolved out, the residue when dried is seed lac. Seed lac is melted, filtered, and stretched into thin sheets, which are broken into flakes when cool. Orange-colored shellac is made from these flakes by dissolving them in alcohol. White shellac is made from bleached lac.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Lac

 

a resin secreted by special glands of the lac insect (the scale Laccifer lacca, a sucking insect that lives on the shoots of certain tropical plants). The nonmotile lac insect coats the surface of the plant from above with a lac scale. The lac, used to make shellac and varnish, is scraped off the shoots and collected; it contains resin (65–80 percent), shellac wax (4–8 percent), and up to 18 percent impurities (plant parts and insect remains).

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

lac

[lak]
(materials)
A resinous material secreted by some insects that live on the sap of certain trees, principally in India; used in the manufacture of shellac.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

lac

A resinous insect secretion used as a base for shellac, lacquer, and varnish.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

lac

a resinous substance secreted by certain lac insects, used in the manufacture of shellac
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
A mapping and prospecting campaign has recently been completed at Lac Rainy with a number of new discoveries of graphite mineralisation identified and mapped on surface, with samples being collected for assay.
All employees and officers of LAC participated in the event.
Speaking on transgressions along the LAC by the PLA, General Officer Commanding-in-Chief (GOC) Northern Command, Lt Gen Ranbir Singh earlier this year said, it "took place in areas where we have different perception of the Line of Actual Control," adding that India and China have well-established mechanisms, especially at the highest level, where special representatives from both the countries discuss issues related to the resolution of the boundary dispute.
It conveyed no information, preventing astronomers from learning about the true nature of BL Lac. The only thing they did know was that the spectrum was unlike anything they had observed before.
Maulana Fazlur Rehman is the owner of assets worth more than Rs64 lac whereas Prime Minister's son-in-law Captain Safdar has assets valued Rs1 crore 42 lac.
This relationship is generally reflected in the data presented in the report, as well as in the gap between the LAC and OECD average tax-to-GDP ratios.
Moving from simplifying matters to engaging with the complexities, the LAC, as advocacy expert and quality contributor, has been instrumental in influencing legislation on numerous occasions.
After the meeting, Lac conducted additional research on the Williams and adjacent properties.
(NASDAQ CM: TACO) have voted in favour of a deal in which a subsidiary of LAC will merge with US-based restaurant operator Del Taco Holdings, Inc., the company said.
The Obishikokaang Collaboration Agreement recently signed between Lac Seul First Nation and Ontario Mining Association member Goldcorp establishes a framework for continued consultation to support existing and future gold mining operations of Goldcorp in the region, as well as opens training, employment, business and contracting opportunities in the Red Lake area.