Definition of "sea louse" [sea• louse]

• A copepod within the order Siphonostomatoida; a kind of marine ectoparasite that feeds on the mucus, epidermal tissue and blood of fishes. (noun)

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• "The evidence was shockingly conclusive: the GPR printout showing the insertion shaft in the Milne Ice Shelf; photos of a living sea louse resembling NASA's fossil; Dr. Pollock's article on ocean chondrules; and microprobe data showing ultradepleted zirconium in the meteorite."