myofibrils

Slender threads which can be rendered visible in a muscle fibre by maceration in certain acids. They run parallel with the long axis of the fibre, and are composed of numerous myofilaments ( = microfilaments). ... (12 Dec 1998) ...
Found on http://www.encyclo.co.uk/local/20973

myofibrils

Slender threadlike structures, bundles of which make up each muscle fiber.
Found on http://www.thehorse.com/Glossary.xhtml?L=M

Myofibrils

Striated contractile microfilaments in skeletal muscle cells.
Found on http://www.superglossary.com/Glossary/Science/Biology/
No exact match found