noun

• Quercus - Associação Nacional de Conservação da Natureza (Quercus - National Association for Nature Conservation) is a Portuguese environmental organization founded in 1985.
• Quercus or oak, is a genus of trees and shrubs.
• a formerly independent publishing house, based in London, that was acquired by Hodder & Stoughton in 2014.
• a 2013 live album by English folksinger June Tabor, Welsh jazz pianist Huw Warren & English saxophonist Iain Ballamy.