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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
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 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.
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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 It might be outdated or ideologically biased.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 ?
Following the standard naming convention for variable stars, it was designated BL Lacertae, or BL Lac for short.
Yet, the impact of GR&AP's work is best measured in people not resorting to the LAC for guidance, but using the resources they have made available to the public and moving forward in an empowered manner to access services or stand on their rights.
Mille Lacs Health System is a not-for-profit, community-owned organization that has been providing healthcare services for the people of the Mille Lacs area for over 50 years.
St-Onge, M.R., and Lucas, S.B., 1993, Geology of the eastern Cape Smith Belt: parts of the Kangiqsujuaq, Cratere du Nouveau Quebec, and lacs Nuvilik Map Areas, Quebec: Geological Survey of Canada, Memoir 438, 110 p.
LACS refused to supply the un-edited footage to the FWP inquiry team,and declined an invitation to attend the hearing.
This concerns the Central Advisory Council, or CAC, the group of LAC presidents, vice presidents, secretaries and treasurers.
The intensity of gamma radiation from each source -- quasar relatives called BL Lac objects -- represents 10 trillion times the output of the sun at all wavelengths.
Moreover, Rupees 67 thousand and five hundred will be charged on account of income tax from the individuals who have an annual income over Rupees 20 lacs and Rupees 25 lacs in addition to the 17.5 percent income tax on their income above Rupees 20 lacs.
The results for Q4 FY12 show that the Total Income stood at Rs.18783.13 Lacs as against Rs.15257.25 Lacs for Q4 FY 11.Similarly, Net Profit stood at Rs.545.27 Lacs for Q4 FY12 as against Rs.653.40 Lacs for the corresponding quarter of last year.
For some time their true nature was unknown, but astronomers now believe BL Lacs represent one manifestation of an active galactic nucleus (S&T: August 1992, page 138).