1. Root

 gladʰ

2. Lexical meanings

 EN: smooth

3. Comparative evidence

4. Formally comparable roots

 1.gal, 1.gel, 2.gal, 2.glei̯, 2.gel, 2.gel, 3.gal, 3.gelh₁, 3.gelh₂, 3.gelh₃, gelǵʰ, gel, geldʰ, gleh₃gʰ, glei̯, glei̯bʰ, glei̯h₁, glei̯h₂, glei̯h₃, gleu̯, gleu̯bʰ

5. Formally/Semantically comparable roots

6. Revised root variants

7. Comments

8. References

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