Unknown; possibly related to Hittite 𒅕𒄩𒀸 (er-ḫa-aš /erḫaš/, “line, boundary”), Latvian āra, perhaps all from Proto-Indo-European *h₁erh₂- (“border, line”).
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Practica a expresión oral e a memorización de " ora " e moitas outras palabras e frases latín .