n. Cylindrical organelles, found within muscle cells, that are the contractile unit of muscles.
The Century Dictionary and Cyclopedia
n. A muscle-fibril.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. one of many contractile filaments that make up a striated muscle fiber
Word Usage
"However, as the disease progresses, cardiomyocytes show deterioration in some mitochondrial as well as myofibril features, evidenced by swelling of mitochondria, misalignment of myofibril structure, and blurring as well as breakage of Z-lines."