zarziyr (Hebrew #2223)
properly, tightly girt, i.e. probably a racer, or some fleet animal (as being slender in the waist)
KJV usage: + greyhound.
Pronounce: zar-zeer'
Origin: by reduplication from 2115
mothen (Hebrew #4975)
properly, the waist or small of the back; only in plural the loins
KJV usage: + greyhound, loins, side.
Pronounce: mo'-then
Origin: from an unused root meaning to be slender