EXAMPLES | WORD ORIGIN noun . Biochemistry a globulin that is present in muscle plasma and that in connection with myosin plays an important role in muscle contraction. Origin of actin 1940–45;
-in 2 variant of actino- before a vowel: actinism.
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for actin Historical Examples of actin
actin' as if she'd a cup of tea, too," muttered her companion, Ned.
And yet, if she wanted Jonadab, she was
actin' mighty funny.
The nigher we got, the harder he stared; and the man in front was
actin' similar in regards to him.
All I should be able to think of was what she wore, or didn't wear, when she was
actin' her parts.
Your Uncle Zoeth and me have been
actin' as your pilots for a consider'ble spell. British Dictionary definitions for actin noun a protein that participates in many kinds of cell movement, including muscle contraction, during which it interacts with filaments of a second protein, myosin Word Origin for actin
act + -in
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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n. One of the protein components found in muscle, existing as F-actin or G-actin, into which actomyosin can be split and which acts with myosin in muscle contraction.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
A protein found in all eukaryotic cells, forming filaments that make up a main component of the cell's supporting matrix or cytoskeleton. Actin and the protein myosin together make up the contractile units (called sarcomeres) of skeletal muscle fibers.
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.