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sirenian

[sahy-ree-nee-uh n] /saɪˈri ni ən/
noun
1.
an aquatic, herbivorous mammal of the order Sirenia, including the manatee and dugong.
Origin
1880-1885
1880-85; < New Latin Sireni(a) (see siren, -ia) + -an
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for sirenian

sirenian

/saɪˈriːnɪən/
adjective
1.
of, relating to, or belonging to the Sirenia, an order of aquatic herbivorous placental mammals having forelimbs modified as paddles, no hind limbs, and a horizontally flattened tail: contains only the dugong and manatees
noun
2.
any animal belonging to the order Sirenia; a sea cow
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for sirenian

any of four large aquatic mammalian species now living primarily in tropical waters where food plants grow. The three species of manatee (genus Trichechus) occupy warm latitudes of the coastal Atlantic and associated rivers, and the dugong (Dugong dugon) inhabits the coastlines of the Indian and Pacific oceans. The extinct Steller's sea cow (Hydrodamalis gigas), formerly of the Bering Sea, also belonged to the dugong family, but all were killed off by humans less than 30 years after they were first scientifically described in 1741. Steller's sea cow was the largest sirenian and one of the few sirenians to occupy cold water. The term sea cow is now sometimes used to refer collectively to sirenians.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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