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orphanage a place where orphans live and are cared for.
orthodontics (used with a singular verb) the branch of dental medicine that deals with the straightening of teeth.
orthodontist a dentist who works in the branch of dental medicine that deals with the straightening of teeth.
orthodox of, having to do with, or following what is believed or practiced by most other people.
Oslo the capital city of Norway.
osmosis the passage of a liquid through a membrane until the concentration is the same on both sides of the membrane.
ostrich a large, powerful African bird that can run very fast but cannot fly. It has two toes on each foot and no feathers on its long legs and neck.
other different from the one mentioned. [11 definitions]
otherwise in a different manner or other way. [3 definitions]
Ottawa the capital city of Canada. Ottawa is in the province of Ontario. [2 definitions]
otter a mammal with brown fur, a long body, short legs, and webbed feet. Otters live in the water where they eat fish, frogs, and other water animals. Different kinds of otters are found in most parts of the world. They live in groups and are very playful. Otters are related to skunks, badgers, and other kinds of weasels.
ouch a word used to express sudden pain.
ought used to express the need to do something because of duty or responsibility. [3 definitions]
ounce1 a unit of weight equal to one sixteenth of a pound or 28.350 grams. (abbreviated: oz.) [3 definitions]
our belonging to, done by, or having to do with us.
ours the one or ones that belong to, are done by, or have to do with us.
ourselves our own selves (used to show that an action is done to the same people who are doing the action). [3 definitions]
-ous a suffix that means "having much" or "full of."
oust to force out; expel.
out beyond the limits; away. [13 definitions]
out- a prefix that means "out," "outside," or "outward." [2 definitions]