rostrum rostrumupper jaw of whales that is elongated and looks like a beak Related Articles: Amazon River Dolphin, BotoBaiji, Yangtze River DolphinBeaked WhalesBryde's WhaleCommon DolphinMinke WhalesIndo-Pacific Humpback DolphinRisso's DolphinSpinner Dolphin Chris Knowlton2017-02-26T20:10:01-05:00