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lac

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lac

a resinous substance secreted by certain lac insects, used in the manufacture of shellac
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

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.
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 It might be outdated or ideologically biased.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.
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The landing craft tank LCT 7074 took part in Operation Neptune, the naval element of the Allied invasion of northern France in 1944, a vast undertaking that involved 7,000 ships and craft to land 160,000 soldiers on to the beaches of Normandy.
When the parameter matrix A is with some special cases, the LCT reduces to FT, FRFT, Fresnel transform, and scaling operation [24].
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