Hydrobates pelagicus hyd·ro·ba·tespelagicus uncommon noun 1. sooty black petrel with white markings; of the northern Atlantic and Mediterranean Synonymsstormy petrelnorthern storm petrelHydrobates pelagicus Related words Broader terms storm petrel Parts Hydrobates WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.