downy brome dow·nyb·rome uncommon noun 1. annual or winter annual grass with softly hairy leaves of the Mediterranean Synonymsdowny bromedowny bromegrassdowny cheatdowny chesscheatgrassdrooping bromeBromus tectorum Related words Word family downy bromegrass Broader terms brome WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.