SINEW

[specialized] tendon [noun] - a strong cord in the body connecting a muscle to a boneMuscles need strong sinews to work effectively. [C](figurative) We will fight with all our sinew (= strength). [U](figurative) These steel posts form the sinews of the building (= method of support and strength). [C](esp. UK literary) The sinews of war are the money needed for weapons and supplies during a war.