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oceanography the science that studies the oceans and the animals and plants that live in oceans.
ocelot a wild cat with yellow or brown fur and black spots or stripes. Ocelots look like leopards but are smaller. They live in South and Central America, sometimes as far north as Texas. They are carnivorous mammals that eat birds, snakes, and small mammals.
o'clock of or according to the clock.
Oct. an abbreviation for October.
oct- see octo-.
octagon a flat closed figure with eight straight sides.
octave a musical tone with the same name as another, higher or lower tone. When a tone is played with its octave, the tones blend together and sound almost like a single note. The higher of the tones in an octave always has twice as many vibrations per second as the lower note. [2 definitions]
octo- a prefix that means "eight."
October the tenth month of the year. October has thirty-one days.
octopus a sea animal with a soft, rounded body and eight long tentacles. Octopuses are carnivores that eat crabs, lobsters, and other small sea animals. They are mollusks and are closely related to squids.
odd different from what is expected or usual; strange. [4 definitions]
oddity a strange or unusual thing, person, or event. [2 definitions]
odds the probability that one thing is more likely to happen than another. [2 definitions]
odds and ends a group of different kinds of items; bits and pieces; scraps.
odor smell or scent.
odour a spelling of odor used in Canada and Britain. See odor for more information.
of used to show distance or separation from. [10 definitions]
of course certainly. [2 definitions]
off away from a surface. [13 definitions]
off base wrong; mistaken
offence a spelling of offense used in Canada and Britain. See offense for more information.