plural o's or os ˈōz
often capitalized, often attributive
: the 15th letter of the English alphabet
: a graphic representation of this letter
: a speech counterpart of orthographic o
: a graphic device for reproducing the letter o
: one designated o especially as the 15th in order or class
less common spelling of oh
—used to express an emotion (such as surprise or desire) or in response to physical stimuli
Oh, no! I forgot my key.
Oh, don't stop!
—used in direct address
oh, waiter! Will you come here, please?
—used to express acknowledgment or understanding of a statement
Oh, yes. It's one of my favorite cities.
—used to introduce an example or approximation
Their house is about, oh, I'd say four miles from here.
: the one of the four ABO blood groups characterized by the absence of antigens designated by the letters A and B and by the presence of antibodies against these antigens
[New Latin octarius] pint
variants or oo-
specifically : ovum
orth- or ortho-
-o-9 of 11
—used as a connective vowel originally to join word elements of Greek origin and now also to join word elements of Latin or other origin
: one that is, has the qualities of, or is associated with
-o11 of 11
—in interjections formed from other parts of speech
Examples of o in a Sentence
Noun (1) a word that starts with an o a word that starts with o
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