1. Root

 h₁erkʷ

2. Lexical meanings

 DE: singen, strahlen
EN: beam, praise, radiate

3. Comparative evidence

 Anatolian, Armenian, Indic

4. Formally comparable roots

 1.h₁er, 1.h₁erh₁, 1.h₁erh₂, 1.h₁erh₃, 1.h₁reh₁, 1.h₁reu̯dʰ, 2.h₁er, 2.h₁erh₁, 2.h₁erh₂, 2.h₁rebʰ, 2.h₁reh₁, 3.h₁erh₁, h₁erd, h₁ers, h₁er, h₁erh₃dʰ, h₁er, h₁eri̯, h₁erk, h₁ers, h₁erǵʰ, h₁reh₁s, h₁rei̯, h₁rei̯d, h₁rei̯p, h₁rei̯ḱ, h₁rem, h₁rep, h₁reu̯g, h₁reḱs

5. Formally/Semantically comparable roots

6. Revised root variants

7. Comments

8. References

LIV = Rix, Helmut et al. 2001. Lexikon der indogermanischen Verben: Die Wurzeln und ihre Primärstammbildungen. 2 Aufl. Wiesbaden: Dr. Ludwig Reichert Verlag.

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