Where does “szigetelők” come from?

szigetelők (Hungarian) comes from Hungarian szigetelő, from Hungarian szigetel, from Hungarian -él, from Hungarian -é-, from Hungarian -d, from Middle Welsh -nt — 3rd person plural verb ending.

Ancestry of “szigetelők”, step by step

Step	Language	Word	Meaning
1	Hungarian	szigetelő	insulating, sealing
2	Hungarian	szigetel	to insulate
3	Hungarian	-él	Added to a verb to form a noun; Added to a verb...
4	Hungarian	-é-	—
5	Hungarian	-d	your; Used in the second-person singular definite...
6	Middle Welsh	-nt	3rd person plural verb ending

Every word from Middle Welsh -nt →Every word from Hungarian -d →Every word from Hungarian -él →