• WordNet 3.6
    • n Sirenia an animal order including: manatees; dugongs; Steller's sea cow
    • ***
Webster's Revised Unabridged Dictionary
    • n. pl Sirenia (Zoöl) An order of large aquatic herbivorous mammals, including the manatee, dugong, rytina, and several fossil genera.☞ The hind limbs are either rudimentary or wanting, and the front ones are changed to paddles. They have horny plates on the front part of the jaws, and usually flat-crowned molar teeth. The stomach is complex and the intestine long, as in other herbivorous mammals. See Cetacea.
    • ***
Chambers's Twentieth Century Dictionary
    • n Sirenia an order of aquatic mammals now represented by the dugong (Halicore) and the manatee (Manatus)
    • ***


Webster's Revised Unabridged Dictionary
Chambers's Twentieth Century Dictionary
L. siren—Gr. seirēn, prob. seira, a cord.


In literature:

The former thus constitute the order Sirenia, while the latter belong to the Cetacea.
"On the Genesis of Species" by St. George Mivart
Sirenia, which also includes the manatees.
"The New Gresham Encyclopedia" by Various
The manga belongs to the small but singular group of animals classed as SIRENIA.
"Lost in the Jungle" by Paul Du Chaillu
SIRENIA, nakedness of, i.
"The Descent of Man and Selection in Relation to Sex" by Charles Darwin
The Sirenia, too, are comparatively hairless, as are also many Ungulates.
"The Cambridge Natural History, Vol X., Mammalia" by Frank Evers Beddard