Biochemistry. any of numerous, highly varied organic molecules constituting a large portion of the mass of every life form and necessary in the diet of all animals and other nonphotosynthesizing organisms, composed of 20 or more amino acids linked in a genetically controlled linear sequence into one or more long polypeptide chains, the final shape and other properties of each protein being determined by the side chains of the amino acids and their chemical attachments: proteins include such specialized forms as collagen for supportive tissue, hemoglobin for transport, antibodies for immune defense, and enzymes for metabolism.
the plant or animal tissue rich in such molecules, considered as a food source supplying essential amino acids to the body.
(formerly) a substance thought to be the essential nitrogenous component of all organic bodies.
Biochemistry. of the nature of or containing protein.
- Also pro·teid [proh-teed, -tee-id]. /ˈproʊ tid, -ti ɪd/.
- pro·tein·a·ceous [proh-tee-ney-shuhs, -tee-i-ney-], /ˌproʊ tiˈneɪ ʃəs, -ti ɪˈneɪ-/, pro·tein·ic, pro·tei·nous, adjective
- non·pro·tein, noun
- protean, protein
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use protein in a sentence
Quickly disposing of RNA is one way to control how much of a particular protein is made.Here’s why COVID-19 vaccines like Pfizer’s need to be kept so cold | Tina Hesman Saey | November 20, 2020 | Science News
Instead, he thought it would be a third kind of test, called an antigen test, which detects special proteins in the virus.The FDA just okayed a rapid at-home COVID test—but it won’t work for everyone | Tara Santora | November 20, 2020 | Popular-Science
Exercise also triggers the body to make a protein called BDNF.
Both vaccines use messenger RNA, or mRNA, to carry instructions for making the coronavirus’ spike protein to human cells.New Pfizer results show its COVID-19 vaccine is nearly 95% effective | Tina Hesman Saey | November 18, 2020 | Science News
Our immune system can then then make antibodies to latch onto those spike proteins.Moderna vaccine for COVID-19 appears nearly 95 percent effective | Erin Garcia de Jesus | November 16, 2020 | Science News For Students
British Dictionary definitions for protein
any of a large group of nitrogenous compounds of high molecular weight that are essential constituents of all living organisms. They consist of one or more chains of amino acids linked by peptide bonds and are folded into a specific three-dimensional shape maintained by further chemical bonding
- proteinaceous, proteinic or proteinous, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for protein
Any of a large class of complex organic chemical compounds that are essential for life. Proteins play a central role in biological processes and form the basis of living tissues. They consist of long chains of amino acids connected by peptide bonds and have distinct and varied three-dimensional structures, usually containing alpha helices and beta sheets as well as looping and folded chains. Enzymes, antibodies, and hemoglobin are examples of proteins.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.