from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The system of actin and myosin that, with other substances, constitutes muscle fiber and is responsible for muscular contraction.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A protein complex composed of actin and myosin, found in muscle fibres.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a protein complex in muscle fibers; composed of myosin and actin; shortens when stimulated and causes muscle contractions
act(in) + myosin.(American Heritage® Dictionary of the English Language, Fourth Edition)