Webster's English Dictionary

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intrados

in.tra.dos \'in-tr*-.da:s, -.do-; in-'tra--.da:s\ \-.do-z, -.da:s\ 
   \-.da:s-*z\ n or in.tra.dos or in.tra.dos.es [F, fr. L intra within + F dos 
   back back - more at DOSSIER] pl  : the interior curve of an arch