Where does “aardslak” come from?

aardslak (Dutch) comes from Dutch aard, from Middle Dutch āert, from Old Dutch ard, from Proto-West Germanic *ardi, from Proto-Germanic ardiz, from Proto-Indo-European h₂erh₃-, from Proto-Indo-European h₁er- — earth.

aardslak (Dutch): keelback slug, any slug of the Limacidae

Definitions

keelback slug, any slug of the Limacidae

Ancestry of “aardslak”, step by step

aardslak traces back through two separate lines of ancestry.

via Dutch aard

Step	Language	Word	Meaning
1	Dutch	aard	nature, character, disposition; Alternative form...
2	Middle Dutch	āert	—
3	Old Dutch	ard	—
4	Proto-West Germanic	*ardi	—
5	Proto-Germanic	ardiz	characteristic; inborn quality; nature;...
6	Proto-Indo-European	h₂erh₃-	to plough
7	Proto-Indo-European	h₁er-	earth

via Dutch slak

Step	Language	Word	Meaning
1	Dutch	slak	snail, slug; slag; hard, molten leftovers of...
2	Middle Dutch	slecke	snail
3	Old Dutch	slekki	—
4	Proto-Germanic	slikkō	—

Every word from Proto-Indo-European h₁er- →Every word from Proto-Indo-European h₂erh₃- →Every word from Proto-Germanic ardiz →