| o'clock |
of or according to the clock. |
| Oct. |
abbreviation of "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] |
| odd number |
a whole number that cannot be divided exactly by 2. |
| 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. |
| offend |
to cause to be angry, annoyed, or insulted. |