the GNU version of the Collaborative International Dictionary of English
adj. rising in billows.
adj. stormy; affected by storms; -- of weather, used prenominally.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. characterized by great swelling waves or surges
Word Usage
"I knew this as I turned on the morning news to see a shot of the Empire State Building in the foreground and the World Trade Center with black smoke billowing from the North Tower."