Refers to muscle tissue in the body. Common in compounds like 筋肉 (きんにく).
I've strained a muscle.
abdominal muscles; abs · sit-up; ab exercise
physical strength; muscle strength
rebar; reinforcing bar · reinforced concrete
cardiac muscle; heart muscle; myocardium
sphincter; constrictor muscle
muscular dystrophy
muscle fiber
muscles and bones; physique; body build · cartilage
myoma; muscle tumor
main reinforcement; main rebar
extensor muscle; protractor
masseter muscle
flexor muscle; flexor
hoop; tie hoop; lateral tie
levator; levator muscle
oblique muscle
gluteus; gluteal muscle
rectus muscle; rectus
ocular muscle; eye muscle
Standard kanji spelling for 'muscle' in anatomical and everyday contexts.
The kanji 筋 originally referred to sinews or tendons. The reading きん is the on'yomi, commonly used in medical and anatomical terms.