actin

[ak-tuhn]
noun Biochemistry.
a globulin that is present in muscle plasma and that in connection with myosin plays an important role in muscle contraction.

Origin:
1940–45; perhaps act + -in2

Dictionary.com Unabridged

actin-

variant of actino- before a vowel: actinism.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
actin (ˈæktɪn)
 
n
a protein that participates in many kinds of cell movement, including muscle contraction, during which it interacts with filaments of a second protein, myosin
 
[C20: from act + -in]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

actin ac·tin (āk'tĭn)
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.
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American Heritage
Science Dictionary
actin   (āk'tĭn)  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
One that churns out actin and myosin, which link up to form units that can
  expand and contract, will become a muscle cell.
Nucleated cells have an internal scaffolding called a cytoskeleton, made in
  part of filaments of the protein actin.
Myosin is a small globular proteins with two little feet that move in discrete
  steps along long chains of actin.
These little guys crawl rather than swim, and the amazing thing is they have no
  actin.
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