a group of languages, usually classified as Italic, that contains Oscan and Umbrian.
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British Dictionary definitions for Osco-Umbrian
a group of extinct languages of ancient Italy, including Oscan, Umbrian, and Sabellian, which were displaced by Latin
relating to or belonging to this group of languages
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012