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Meaning of O

Pronunciation:  ow

WordNet Dictionary
  1. [n]  the 15th letter of the Roman alphabet
  2. [n]  the blood group whose red cells carry neither the A nor B antigens; "people with type O blood are universal donors"
  3. [n]  a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust

O is a 1 letter word that starts with O.


 Synonyms: atomic number 8, group O, oxygen, type O
 See Also: air, alphabetic character, blood group, blood type, chemical element, element, gas, H2O, letter, letter of the alphabet, liquid oxygen, LOX, ozone, Roman alphabet, water



Webster's 1913 Dictionary
  1. \O\ ([=o]).
    1. O, the fifteenth letter of the English alphabet, derives
       its form, value, and name from the Greek O, through the
       Latin. The letter came into the Greek from the
       Ph[oe]nician, which possibly derived it ultimately from
       the Egyptian. Etymologically, the letter o is most closely
       related to a, e, and u; as in E. bone, AS. b[=a]n; E.
       stone, AS. st[=a]n; E. broke, AS. brecan to break; E.
       bore, AS. beran to bear; E. dove, AS. d[=u]fe; E. toft,
       tuft; tone, tune; number, F. nombre. The letter o has
       several vowel sounds, the principal of which are its long
       sound, as in bone, its short sound, as in nod, and the
       sounds heard in the words orb, son, do (feod), and wolf
       (book). In connection with the other vowels it forms
       several digraphs and diphthongs. See Guide to
       Pronunciation, [sect][sect] 107-129.
    2. Among the ancients, O was a mark of triple time, from the
       notion that the ternary, or number 3, is the most perfect
       of numbers, and properly expressed by a circle, the most
       perfect figure. O was also anciently used to represent 11:
       with a dash over it ([=O]), 11,000.
  2. \O\ ([=o]), n.; pl. {O's} or {Oes} ([=o]z).
    1. The letter O, or its sound. ``Mouthing out his hollow oes
       and aes.'' --Tennyson.
    2. Something shaped like the letter O; a circle or oval.
       ``This wooden O [Globe Theater]''. --Shak.
    3. A cipher; zero. [R.]
             Thou art an O without a figure.       --Shak.
  3. \O'\ [Ir. o a descendant.]
    A prefix to Irish family names, which signifies grandson or
    descendant of, and is a character of dignity; as, O'Neil,
  4. \O'\ ([=o]; unaccented [-o]), prep.
    A shortened form of of or on. ``At the turning o' the tide.''
  5. \O\ ([=o]), a. [See {One}.]
    One. [Obs.] --Chaucer. ``Alle thre but o God.'' --Piers
  6. \O\, interj.
    An exclamation used in calling or directly addressing a
    person or personified object; also, as an emotional or
    impassioned exclamation expressing pain, grief, surprise,
    desire, fear, etc.
          For ever, O Lord, thy word is settled in heaven. --Ps.
                                                   cxix. 89.
          O how love I thy law ! it is my meditation all the day.
                                                   --Ps. cxix.
    Note: O is frequently followed by an ellipsis and that, an in
          expressing a wish: ``O [I wish] that Ishmael might live
          before thee !'' --Gen. xvii. 18; or in expressions of
          surprise, indignation, or regret: ``O [it is sad] that
          such eyes should e'er meet other object !'' --Sheridan
    Note: A distinction between the use of O and oh is insisted
          upon by some, namely, that O should be used only in
          direct address to a person or personified object, and
          should never be followed by the exclamation point,
          while Oh (or oh) should be used in exclamations where
          no direct appeal or address to an object is made, and
          may be followed by the exclamation point or not,
          according to the nature or construction of the
          sentence. Some insist that oh should be used only as an
          interjection expressing strong feeling. The form O,
          however, is, it seems, the one most commonly employed
          for both uses by modern writers and correctors for the
          press. ``O, I am slain !'' --Shak. ``O what a fair and
          ministering angel !'' ``O sweet angel !'' --Longfellow.
                O for a kindling touch from that pure flame !
                But she is in her grave, -- and oh The difference
                to me !                            --Wordsworth.
                Oh for a lodge in some vast wilderness !
                We should distinguish between the sign of the
                vocative and the emotional interjection, writing
                O for the former, and oh for the latter. --Earle.
    {O dear}, & {O dear me!} [corrupted fr. F. O Dieu! or It. O
       Dio! O God! O Dio mio! O my God! --Wyman.], exclamations
       expressive of various emotions, but usually promoted by
       surprise, consternation, grief, pain, etc.
Computing Dictionary

ascii code 79, The letter of the alphabet, not to be confused with 0 (zero) the digit.

Biology Dictionary
 Definition: This Latin term, which is frequently used in medicine and pharmacy, means "a pint".