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n.1.(Zool.) Any species of oceanic Siphonophora belonging to the genus Velella.
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The scientists also collected jellyfish called by-the-wind sailors (Velella velella).
David Waines of the Blue Reef Aquarium in Newquay, Cornwall, which identified the creatures, said: "If prevailing winds change direction, by-the-wind sailors may wash up on beaches in great numbers.
Technically, they're velella velellas, more commonly known as by-the-wind sailors, a relative of the Portuguese man-of-war.