1. Root

 gʰreh₁ʷ

2. Lexical meanings

 EN: grind, rub

3. Comparative evidence

4. Formally comparable roots

 1.gʰer, gʰerdʰ, gʰrebh₂, gʰrebʰ, gʰredʰ, gʰreh₁, gʰreh₁u̯, gʰreib, gʰrei̯, gʰrei̯bʰ, gʰrei̯dʰ, gʰrem, gʰers, gʰrend, gʰrendʰ, gʰreh₁d

5. Formally/Semantically comparable roots

 gʰrend, gʰrendʰ

6. Revised root variants

7. Comments

 Extension of *gher- 'to scrape, scratch' (Watkins 2011: 33).

8. References

Watkins 2011 = Watkins, Calvert. 2011. The American heritage dictionary of Indo-European roots. 3rd revised ed. Boston, New York: Houghton Mifflin Harcourt.