terbo'u lujvo

x3=b1 is bone, performing (abstract) function x2=b2 in organism x1=b3.

Cf. kamjybo'u, bogykamju, bongu.

In notes:

bogykamju
k1 is the spine of b3. b3 is a vertebrate.
kamjybo'u
k1=b1 is a vertebra of b3 ; b3 is a vertebrate.