(anatomy, cardiology) The striated and involuntary muscle of the vertebrate heart.

(bodybuilding) A sleeveless shirt tailored to display the muscles of the body.

(anatomy) The voluntary muscle of vertebrates, which is striated and anchored by tendons to bone and is used to effect skeletal movement such as locomotion.

(anatomy) Any of usually three deeply situated muscles on each side of the neck of which each extends from the transverse processes of two or more cervical vertebrae to the first or second rib.

The physiological adaptation of the body to repetition of a specific physical activity, resulting in increased neuromuscular control when performing that activity again.

plural of muscle fiber

plural of muscle fibre

(anatomy) A single cell of a muscle; each muscle fiber contains many myofibrils, the contractile unit of muscles.

Alternative spelling of muscle fiber

(anatomy) A triangular muscle on the human shoulder.