Sp. mochuelo 'owl, specifically non-horned', Pt. mocho 'ibid.' Galego moucho 'ibid'', Catalan 'mussol 'ibid.', Basque mozolo 'ibid.', all prob. < a Hispanic mocho adj. 'mutilated', of uncertain origin: this according to Corominas (DH). Note also Ir. mucha m. 'owl'. DH
Robert Farren, PIE culture words collection, 2017
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