The Collaborative International Dictionary of English v.0.48:

Friar \Fri"ar\, n. [OR. frere, F. fr[`e]re brother, friar, fr.
   L. frater brother. See Brother.]
   1. (R. C. Ch.) A brother or member of any religious order,
      but especially of one of the four mendicant orders, viz:
      (a) Minors, Gray Friars, or Franciscans. (b)
      Augustines. (c) Dominicans or Black Friars. (d) White
      Friars or Carmelites. See these names in the Vocabulary.
      [1913 Webster]

   2. (Print.) A white or pale patch on a printed page.
      [1913 Webster]

   3. (Zool.) An American fish; the silversides.
      [1913 Webster]

   Friar bird (Zool.), an Australian bird (Tropidorhynchus
      corniculatus), having the head destitute of feathers; --
      called also coldong, leatherhead, pimlico; poor
      soldier, and four-o'clock. The name is also applied to
      several other species of the same genus.

   Friar's balsam (Med.), a stimulating application for wounds
      and ulcers, being an alcoholic solution of benzoin,
      styrax, tolu balsam, and aloes; compound tincture of
      benzoin. --Brande & C.

   Friar's cap (Bot.), the monkshood.

   Friar's cowl (Bot.), an arumlike plant (Arisarum vulgare)
      with a spathe or involucral leaf resembling a cowl.

   Friar's lantern, the ignis fatuus or Will-o'-the-wisp.
      --Milton.

   Friar skate (Zool.), the European white or sharpnosed skate
      (Raia alba); -- called also Burton skate, border
      ray, scad, and doctor.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

doctor \doc"tor\, n. [OF. doctur, L. doctor, teacher, fr. docere
   to teach. See Docile.]
   1. A teacher; one skilled in a profession, or branch of
      knowledge; a learned man. [Obs.]
      [1913 Webster]

            One of the doctors of Italy, Nicholas Macciavel. --
                                                  Bacon.
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   2. An academical title, originally meaning a man so well
      versed in his department as to be qualified to teach it.
      Hence: One who has taken the highest degree conferred by a
      university or college, or has received a diploma of the
      highest degree; as, a doctor of divinity, of law, of
      medicine, of music, or of philosophy. Such diplomas may
      confer an honorary title only.
      [1913 Webster]

   3. One duly licensed to practice medicine; a member of the
      medical profession; a physician.
      [1913 Webster]

            By medicine life may be prolonged, yet death
            Will seize the doctor too.            -- Shak.
      [1913 Webster]

   4. Any mechanical contrivance intended to remedy a difficulty
      or serve some purpose in an exigency; as, the doctor of a
      calico-printing machine, which is a knife to remove
      superfluous coloring matter; the doctor, or auxiliary
      engine, called also donkey engine.
      [1913 Webster]

   5. (Zool.) The friar skate. [Prov. Eng.]
      [1913 Webster]

   Doctors' Commons. See under Commons.

   Doctor's stuff, physic, medicine. --G. Eliot.

   Doctor fish (Zool.), any fish of the genus Acanthurus;
      the surgeon fish; -- so called from a sharp lancetlike
      spine on each side of the tail. Also called barber fish.
      See Surgeon fish.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Doctor \Doc"tor\, v. t. [imp. & p. p. Doctored; p. pr. & vb.
   n. Doctoring.]
   1. To treat as a physician does; to apply remedies to; to
      repair; as, to doctor a sick man or a broken cart.
      [Colloq.]
      [1913 Webster]

   2. To confer a doctorate upon; to make a doctor.
      [1913 Webster]

   3. To tamper with and arrange for one's own purposes; to
      falsify; to adulterate; as, to doctor election returns; to
      doctor whisky. [Slang]
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Doctor \Doc"tor\, v. i.
   To practice physic. [Colloq.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Dr \Dr.\ n.
   abbreviation for doctor, a title accorded to a person who
   holds a doctorate degree from an academic institution, such
   as a Ph.D. degree or M.D. degree. [abbrev.]

   Syn: doctor.
        [WordNet 1.5]

   2. a licensed doctor of medicine.

   Syn: doctor, doc, physician, MD, medico.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

doctor
    n 1: a licensed medical practitioner; "I felt so bad I went to
         see my doctor" [syn: doctor, doc, physician, MD,
         Dr., medico]
    2: (Roman Catholic Church) a title conferred on 33 saints who
       distinguished themselves through the orthodoxy of their
       theological teaching; "the Doctors of the Church greatly
       influenced Christian thought down to the late Middle Ages"
       [syn: Doctor of the Church, Doctor]
    3: children take the roles of physician or patient or nurse and
       pretend they are at the physician's office; "the children
       explored each other's bodies by playing the game of doctor"
    4: a person who holds Ph.D. degree (or the equivalent) from an
       academic institution; "she is a doctor of philosophy in
       physics" [syn: doctor, Dr.]
    v 1: alter and make impure, as with the intention to deceive;
         "Sophisticate rose water with geraniol" [syn:
         sophisticate, doctor, doctor up]
    2: give medical treatment to
    3: restore by replacing a part or putting together what is torn
       or broken; "She repaired her TV set"; "Repair my shoes
       please" [syn: repair, mend, fix, bushel, doctor,
       furbish up, restore, touch on] [ant: break, bust]