[gas-trok-nee-mee-uhs, gas-truh-nee-]
noun, plural gastrocnemii [gas-trok-nee-mee-ahy, gas-truh-nee-] . Anatomy.
the largest muscle in the calf of the leg, the action of which extends the foot, raises the heel, and assists in bending the knee.

1670–80; < Neo-Latin < Greek gastroknēm(ía) calf of the leg + Latin -ius noun suffix

gastrocnemial, gastrocnemian, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

gastrocnemius gas·troc·ne·mi·us (gās'trŏk-nē'mē-əs, gās'trə-)
n. pl. gas·troc·ne·mi·i (-mē-ī')
A muscle with its origin from the lateral and medial condyles of the femur, with insertion with the soleus muscle by the Achilles tendon into the lower half of the posterior surface of the calcaneus, with nerve supply from the tibial nerve, and whose action causes plantar flexion of the foot.

The American Heritage® Stedman's Medical Dictionary
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