Epenthetic form of rel, monophthongized from raïl, from an earlier Old Catalan raïu (through hypercorrection), from Latin rādīcem, from Proto-Italic *wrādīks, from Proto-Indo-European *wréh₂ds.
Ćwicz mówienie i zapamiętywanie " arrel " i wielu innych słów i zdań z kataloński .