actin [ ak-t uhn ] SHOW IPA / ˈæk tən / PHONETIC RESPELLING noun Biochemistry. a globulin that is present in muscle plasma and that in connection with myosin plays an important role in muscle contraction.
QUIZ YOURSELF ON “ITS” VS. “IT’S”!
Apostrophes can be tricky; prove you know the difference between "it’s" and "its" in this crafty quiz!
Question 1 of 8
On the farm, the feed for chicks is significantly different from the roosters’; ______ not even comparable.
Origin of actin
-in 2 Other definitions for actin (2 of 2) variant of actino- before a vowel: actinism.
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022
How to use actin in a sentence 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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Medical definitions for actin 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.
Scientific definitions for actin 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.