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Use "medusae" in a sentence
"Adult males and females with the familiar bell-shaped bodies are called medusae, but you would not recognize very young jellyfish as jellyfish at all."
"Even small objects, such as medusae, and fragments of weed floating in mid - sea, were distinguishable at a considerable distance; and fishing-boats could be clearly made out at the distance of a mile."
"Cetacean, for, although the sperm whale has a gullet sufficiently large to admit the body of a man, yet, it can hardly be the fish intended, as the natural food of Cetaceans consists of small animals, such as medusae and crustacea."