The rock
Romance *rokka 'rock' (Italian rocca, French roche, Occitan ròca, Spanish roca, Portuguese rocha) is a Tyrrhenian loanword related to PNC *riqq’wA 'mountain, rock; cave'.
Basque arroka, harroka has a prothetic vowel also found in Gascon arròca1. This is so because Basque doesn't allow rhotics at word-initial.
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1 The Basque word is probably a borrowing from Gascon.
