Uncertain. From Old Galician-Portuguese buraco (13th century), perhaps from a local derivative of Proto-Indo-European *bʰerH- (“to pierce”) + the suffix -aco, from a pre-Latin suffix -akko-. Compare Portuguese buraco, Asturian buracu, furacu.
Pratique falar e memorizar " buraco " e muitas outras palavras e frases em galego .