筋

gristly fish paste (made of muscle, tendons, skin, etc.)

muscular type (Kretschmer's typology); athletic type

Medicine

electromyograph

muscular sense

Abbreviation

muscle sense

Medicine

myotonia

muscle-contraction headache; tension headache

myotonic dystrophy

lineage; pedigree; ancestry

(paper) scoring

Medicine

myalgic encephalomyelitis; ME

Anatomy

muscular tissue

Medicine

myopathy

Physiology

myoelectric prosthesis (arm, hand)

Fiction; Object

Flying Nimbus (magical cloud appearing in the Dragonball manga)

Rare term

muscular toothache

spine; line of the backbone

seam down the back (of clothing)

nape of the neck; back of the neck; scruff of the neck

Common noun

one line; one stretch (e.g. of road); one strand (e.g. of hair); one beam (e.g. of light); one ray; one length (e.g. of rope)

Adjectival nouns or quasi-adjectives (keiyodoshi); Noun, used as a suffix

earnest; resolute; intent; devoted; single-minded

Archaic; Common noun

one bloodline; one clan

Archaic; Adjectival nouns or quasi-adjectives (keiyodoshi)

ordinary; common

to straighten up one's back (e.g. stand up straight, sit up straight); to hold one's head high

lineage; stock; descent; strain; blood relationship

path; route; itinerary

abdominal muscles; abs

ふっきん／ふくきん only; Abbreviation; Noun or participle which takes the aux. verb suru; Intransitive verb

sit-up (exercise)

vein (visible under the skin); bulging veins (esp. in the head)