olemus
(a) organismi keskne tugiosa
(b) selle analoog muus kontekstis
Wiktionary:
1. the series of vertebrae, separated by disks, that encloses and protects the spinal cord, and runs down the middle of the back in vertebrate animals
2. (figuratively) any fundamental support, structure, or infrastructure

vt ka
- magistraal, tuumvõrk