murciélago
/muɾˈθjelaɡo/ · B2 · noun · m
bat
🦇 murciélago = Latin mūs (mouse) + caecus (blind) + vulgus-like -ālicus: 'blind mouse'
Old Spanish was murciégalo, from Latin mūs caecus 'blind mouse' plus a diminutive-style ending. Link mur- to mouse (like 'murine') and -ciégo to ciego 'blind'. Bats are not blind, but the old name stuck.