Plural Nouns Starting with O

Oblati (n. pl.) Children dedicated in their early years to the monastic state.

Oblati (n. pl.) A class of persons, especially in the Middle Ages, who offered themselves and their property to a monastery.

Odonata (n. pl.) The division of insects that includes the dragon flies.

Odontolcae (n. pl.) An extinct order of ostrichlike aquatic birds having teeth, which are set in a groove in the jaw. It includes Hesperornis, and allied genera. See Hesperornis.

Odontornithes (n. pl.) A group of Mesozoic birds having the jaws armed with teeth, as in most other vertebrates. They have been divided into three orders: Odontolcae, Odontotormae, and Saururae.

Ojibways (n. pl.) Same as Chippeways.

Olay (n. pl.) Palm leaves, prepared for being written upon with a style pointed with steel.

Oligochaeta (n. pl.) An order of Annelida which includes the earthworms and related species.

Omahas (n. pl.) A tribe of Indians who inhabited the south side of the Missouri River. They are now partly civilized and occupy a reservation in Nebraska.

Omnivora (n. pl.) A group of ungulate mammals including the hog and the hippopotamus. The term is also sometimes applied to the bears, and to certain passerine birds.

Oneidas (n. pl.) A tribe of Indians formerly inhabiting the region near Oneida Lake in the State of New York, and forming part of the Five Nations. Remnants of the tribe now live in New York, Canada, and Wisconsin.

Onondagas (n. pl.) A tribe of Indians formerly inhabiting what is now a part of the State of New York. They were the central or head tribe of the Five Nations.

Onychophora (n. pl.) Malacopoda.

Oozoa (n. pl.) Same as Acrita.

Opercula (n. pl.) See Operculum.

Ophidia (n. pl.) The order of reptiles which includes the serpents.

Ophiomorpha (n. pl.) An order of tailless amphibians having a slender, wormlike body with regular annulations, and usually with minute scales imbedded in the skin. The limbs are rudimentary or wanting. It includes the caecilians. Called also Gymnophiona and Ophidobatrachia.

Ophiurida (n. pl.) Same as Ophiurioidea.

Ophiurioidea (n. pl.) Alt. of Ophiuroidea

Ophiuroidea (n. pl.) A class of star-shaped echinoderms having a disklike body, with slender, articulated arms, which are not grooved beneath and are often very fragile; -- called also Ophiuroida and Ophiuridea. See Illust. under Brittle star.

Opisthobranchia (n. pl.) Alt. of Opisthobranchiata

Opisthobranchiata (n. pl.) A division of gastropod Mollusca, in which the breathing organs are usually situated behind the heart. It includes the tectibranchs and nudibranchs.

Opisthoglypha (n. pl.) A division of serpents which have some of the posterior maxillary teeth grooved for fangs.

Opisthomi (n. pl.) An order of eellike fishes having the scapular arch attached to the vertebrae, but not connected with the skull.

Optimates (n. pl.) The nobility or aristocracy of ancient Rome, as opposed to the populares.

Orbitelae (n. pl.) A division of spiders, including those that make geometrical webs, as the garden spider, or Epeira.

Oreades (n. pl.) A group of butterflies which includes the satyrs. See Satyr, 2.

Oreosoma (n. pl.) A genus of small oceanic fishes, remarkable for the large conical tubercles which cover the under surface.

Orgies (n. pl.) A sacrifice accompanied by certain ceremonies in honor of some pagan deity; especially, the ceremonies observed by the Greeks and Romans in the worship of Dionysus, or Bacchus, which were characterized by wild and dissolute revelry.

Orgies (n. pl.) Drunken revelry; a carouse.

Ornithodelphia (n. pl.) Same as Monotremata.

Ornithopappi (n. pl.) An extinct order of birds. It includes only the Archaeopteryx.

Ornithopoda (n. pl.) An order of herbivorous dinosaurs with birdlike characteristics in the skeleton, esp. in the pelvis and hind legs, which in some genera had only three functional toes, and supported the body in walking as in Iguanodon. See Illust. in Appendix.

Ornithosauria (n. pl.) An order of extinct flying reptiles; -- called also Pterosauria.

Ornithoscelida (n. pl.) A group of extinct Reptilia, intermediate in structure (especially with regard to the pelvis) between reptiles and birds.

Orthopoda (n. pl.) An extinct order of reptiles which stood erect on the hind legs, and resembled birds in the structure of the feet, pelvis, and other parts.

Orthoptera (n. pl.) An order of mandibulate insects including grasshoppers, locusts, cockroaches, etc. See Illust. under Insect.

Osages (n. pl.) A tribe of southern Sioux Indians, now living in the Indian Territory.

Osar (n. pl.) See 3d Os.

Oscillatoria (n. pl.) Same as Oscillaria.

Oscines (n. pl.) Singing birds; a group of the Passeres, having numerous syringeal muscles, conferring musical ability.

Osteozoa (n. pl.) Same as Vertebrata.

Ostmen (n. pl.) East men; Danish settlers in Ireland, formerly so called.

Ostracea (n. pl.) A division of bivalve mollusks including the oysters and allied shells.

Ostracoda (n. pl.) Ostracoidea.

Ostracodermi (n. pl.) A suborder of fishes of which Ostracion is the type.

Ostracoidea (n. pl.) An order of Entomostraca possessing hard bivalve shells. They are of small size, and swim freely about.

Ottawas (n. pl.) A tribe of Indians who, when first known, lived on the Ottawa River. Most of them subsequently migrated to the southwestern shore of Lake Superior.

Outagamies (n. pl.) See lst Fox, 7.

Outbounds (n. pl.) The farthest or exterior bounds; extreme limits; boundaries.

Ova (n. pl.) See Ovum.

Overalls (n. pl.) A kind of loose trousers worn over others to protect them from soiling.

Overalls (n. pl.) Waterproof leggings.

Ovipara (n. pl.) An artifical division of vertebrates, including those that lay eggs; -- opposed to Vivipara.

Oxyrhyncha (n. pl.) The maioid crabs.

About the author

Mark McCracken

Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English".

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