The hard fatty tissues around the kidneys of cattle and sheep, used in cooking and for making tallow. (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.
Use "suet" in a sentence
"Many Christmas puddings contain suet, but my mother and her mother used butter, because they found suet unappetizing."
"Not only does it mean vegetarians can eat it, but the word suet has developed negative connotations - many people just don't like the sound of it."
"Kidneys are encased in a creamy, waxy fat called suet, which is easily removed by cutting into it and then peeling it away."