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octillion the number represented by the Arabic numeral 1027. [2 definitions]
octo- eight.
October the tenth month of the Gregorian calendar year, having thirty-one days.
October Revolution see "Russian Revolution."
octogenarian being, of, or pertaining to one that is between eighty and ninety years old. [2 definitions]
octopus any of several related carnivorous sea animals with a soft, rounded body and eight long tentacles with two rows of suckers on each. [2 definitions]
octoroon a person whose ancestry is one eighth black.
octuple having or composed of eight parts. [3 definitions]
ocular of, pertaining to, or like the eye or eyes. [3 definitions]
oculist formerly, an ophthalmologist. [2 definitions]
oculomotor designating the nerves that supply the muscles that move each eyeball.
OD abbreviation of "overdose."
odalisque a female slave or concubine in a harem.
odd different from what is expected or customary; strange. [7 definitions]
oddball (informal) a person or thing that is unconventional or eccentric. [2 definitions]
oddity a peculiar or puzzling thing, person, or event. [2 definitions]
odd man out any outsider; one who has been excluded. [2 definitions]
oddment a leftover or isolated item; one item among several odds and ends. [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. [4 definitions]
odds and ends miscellaneous items; bits and pieces; scraps.