in·ter·spi·na·lis \ˌintə(r)ˌspīˈnalə̇s, -nāl-, -näl-\noun (pluralinter·spina·les \-a(ˌ)lēz, -ā(ˌ)lēz, -äˌlās\) Etymology: New Latin, from inter- + Late Latin spinalis spinal — more at spinal : any of various short muscles connecting the spinous processes of contiguous vertebrae