noun 1. the Provençal language as found in documents from the 11th to the 16th centuries. Abbreviation: OPr.
noun 1. a Baltic language extinct since the 17th century. Abbreviation: OPruss. noun 1. the former language of the non-German Prussians, belonging to the Baltic branch of the Indo-European family: extinct by 1700
- Old red sandstone
noun 1. a thick sequence of sedimentary rock (generally, but not always, red) deposited in Britain and NW Europe during the Devonian period 2. (in Britain) another term for Devonian
noun 1. .