Definition of "lac" []

• A resinous secretion of the lac insect deposited on trees and used in making shellac. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Now, an operon is a little segment of DN A in a bacteria which codes for a couple of genes, and genes code for proteins, and the proteins usually have related functions or function as a group, and one of them is called the lac operon which is used to, the proteins of which are necessary for the bacterium Escherichia coli to metabolize a sugar called lactose, which is a milk sugar."
• "This is a figure again taken from that biochemistry textbook by Voet and Voet discussing a system called the lac operon."
• "The females never escape and after impregnation their ovaries become filled with a red fluid which forms a valuable dye known as lac dye."