velella

[vuh-lel-uh]
noun
a floating colony of hydrozoans of the genus Velella, having a vertical crest that is used as a sail.

Origin:
1825–35; < Neo-Latin, equivalent to Latin vēl(um) sail + -ella -ella

velellidous, adjective
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Example sentences
Velella velella, by-the-wind-sailors, covering the beach at high-tide line.
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