backbone    urutirigōngo, uruti rw'umugōngo, agatirigōngo
En-En dictionary 
agatirigōngo (udu-  7  class 7
singular: aka-,aga-
plural: utu-,udu-
  
backbone, vertebral column
uruti rw'umugongo   phr    backbone
urutirigōngo (in-)     6  class 6
singular: uru-
plural: in-
  
backbone, vertebral column (from uruti rw'umugōngo)