wil·li·waw noun orwil·ly·waw\ˈwilēˌwȯ\; orwul·li·wa\ˈwəl-\ (-s) Etymology: origin unknown 1. a.: a sudden violent gust of cold land air common along mountainous coasts of high latitudes b.: any sudden violent wind 2.: a violent commotion or agitation : storm, tempest < kicking up a great williwaw of dust — Time >