Byrd US/ˈbɜrd/ uncommon noun 1. English organist and composer of church music; master of 16th century polyphony; was granted a monopoly in music printing with Thomas Tallis (1543-1623) SynonymsWilliam Byrd 2. explorer and United States naval officer; led expeditions to explore Antarctica (1888-1957) SynonymsRichard E. ByrdRichard Evelyn ByrdAdmiral Byrd Related words Broader terms explorernaval officerorganistcomposer WordNet 2.1 (Princeton University). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.