lac

(redirected from LCT)
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 It might be outdated or ideologically biased.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 ?
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].
In the offspring from mothers with long-term exposure LCT, we also observed a significant induction of oxidative stress.
He had actually spotted LCT 427 but, because of the battle conditions, he couldn't confirm if he was heading to the beaches or leaving.
Kim is the first who has been arrested because of the LCT accident.
Due to its low prevalence, the etiology of LCTs is not well understood.
Supplementing MCT resulted in consistently higher blood levels of BOHB in our cohort of healthy adults relative to LCT treatment, with higher BOHB at all time points in the MCT group (Figure 2).
LCT 7074 offloaded three different types of tanks on the British landing ground known as Sword Beach.
LCT can enable more tactical warfighters to be able to use protected satellite communications, so they can have assured connectivity in contested environments.
Staff members of LCT facilities were offered serologic testing by ELISA or IFT.
It is a natural question to extend the QFT to the linear canonical transform (LCT) domains and then it is the so-called quaternionic linear transform (QLCT).