1. Root

 h₃nebʰ

2. Lexical meanings

 DE: Nabel

3. Comparative evidence

4. Formally comparable roots

 h₃engʷ, h₃nedʰ, h₃neh₂, h₃nei̯d

5. Formally/Semantically comparable roots

6. Revised root variants

7. Comments

8. References

NIL = Wodko Dagmar S., Britta Irslinger, Carolin Schneider (eds.). 2008. Nomina im Indogermanischen Lexikon. Heidelberg: Winter.