Where does “airsean” come from?

airsean (Irish) comes from Irish air, from Old Irish airid, from Proto-Celtic aryeti, from Proto-Indo-European h₂éryeti, from Proto-Indo-European h₂erh₃-, from Proto-Indo-European h₁er- — earth.

airsean (Irish): third-person singular masculine emphatic of ar:...

Definitions

third-person singular masculine emphatic of ar:...

Ancestry of “airsean”, step by step

Step	Language	Word	Meaning
1	Irish	air	plough; genitive singular of ar; third-person...
2	Old Irish	airid	to plough/plow, to till
3	Proto-Celtic	aryeti	to plough/plow
4	Proto-Indo-European	h₂éryeti	to be ploughing
5	Proto-Indo-European	h₂erh₃-	to plough
6	Proto-Indo-European	h₁er-	earth

Every word from Proto-Indo-European h₁er- →Every word from Proto-Indo-European h₂erh₃- →Every word from Proto-Indo-European h₂éryeti →