noun
calf muscle; gastrocnemius
Anatomical term for the calf muscle. In everyday conversation, ふくらはぎ is more common.
腓腹筋はふくらはぎの主要な筋肉です。
The gastrocnemius muscle is the main muscle of the calf.
noun which may take the genitive case particle 'no'
sural; of the calf
Used in medical or anatomical contexts as a no-adjective, e.g., 腓腹神経 (sural nerve).
腓腹神経は足の外側の感覚を伝えます。
The sural nerve transmits sensation from the outer side of the foot.