HP Sassoon(1) 203.4 :כד חסרן מן חומרי דשדרה אפילו חדא בעלמא‏ : when even merely one of the vertebrae of (the animal's) spine is missing
See the entire entry for ḥumrā, ḥmurtā/ḥumrṯā n.f. cylinder; bead; amulet

HP Sassoon(1) 203.4 :כד חסרן מן חומרי דשדרה אפילו חדא בעלמא‏ : when even merely one of the vertebrae of (the animal's) spine is missing
See the entire entry for ḥsr vb. to be lacking