a person licensed to practice medicine, as a physician, surgeon, dentist, or veterinarian.
a person who has been awarded a doctor's degree: He is a Doctor of Philosophy.
Older Slang. a cook, as at a camp or on a ship.
Machinery. any of various minor mechanical devices, especially one designed to remedy an undesirable characteristic of an automatic process.
Angling. any of several artificial flies, especially the silver doctor.
an eminent scholar and teacher.
verb (used with object)
to give medical treatment to; act as a physician to: He feels he can doctor himself for just a common cold.
to treat (an ailment); apply remedies to: He doctored his cold at home.
to restore to original or working condition; repair; mend: She was able to doctor the chipped vase with a little plastic cement.
to tamper with; falsify: He doctored the birthdate on his passport.
to add a foreign substance to; adulterate: Someone had doctored the drink.
to revise, alter, or adapt (a photograph, manuscript, etc.) in order to serve a specific purpose or to improve the material: to doctor a play.
to award a doctorate to: He did his undergraduate work in the U.S. and was doctored at Oxford.
verb (used without object)
to practice medicine.
Older Use. to take medicine; receive medical treatment.
Metallurgy. (of an article being electroplated) to receive plating unevenly.

1275–1325; Middle English docto(u)r (< Anglo-French) < Latin, equivalent to doc(ēre) to teach + -tor -tor

doctoral, doctorial [dok-tawr-ee-uhl, -tohr-] , adjective
doctorally, doctorially, adverb
doctorless, adjective
doctorship, noun
subdoctor, noun
superdoctor, noun
underdoctor, noun
undoctored, adjective

doctor, physician. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
doctor (ˈdɒktə)
1.  a person licensed to practise medicine
2.  a person who has been awarded a higher academic degree in any field of knowledge
3.  chiefly (US), (Canadian) a person licensed to practise dentistry or veterinary medicine
4.  (often capital) Also called: Doctor of the Church a title given to any of several of the leading Fathers or theologians in the history of the Christian Church down to the late Middle Ages whose teachings have greatly influenced orthodox Christian thought
5.  angling any of various gaudy artificial flies
6.  informal a person who mends or repairs things
7.  slang a cook on a ship or at a camp
8.  archaic a man, esp a teacher, of learning
9.  a device used for local repair of electroplated surfaces, consisting of an anode of the plating material embedded in an absorbent material containing the solution
10.  (in a paper-making machine) a blade that is set to scrape the roller in order to regulate the thickness of pulp or ink on it
11.  a cool sea breeze blowing in some countries: the Cape doctor
12.  slang (Austral) go for the doctor to make a great effort or move very fast, esp in a horse race
13.  what the doctor ordered something needed or desired
14.  (tr)
 a.  to give medical treatment to
 b.  to prescribe for (a disease or disorder)
15.  informal (intr) to practise medicine: he doctored in Easter Island for six years
16.  (tr) to repair or mend, esp in a makeshift manner
17.  (tr) to make different in order to deceive, tamper with, falsify, or adulterate
18.  (tr) to adapt for a desired end, effect, etc
19.  (tr) to castrate (a cat, dog, etc)
[C14: from Latin: teacher, from docēre to teach]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1300, "Church father," from O.Fr. doctour, from M.L. doctor "religious teacher, adviser, scholar," from L. doctor "teacher," from doct- stem of docere "to show, teach," originally "make to appear right," causative of decere "be seemly, fitting" (see decent). Meaning of
"holder of highest degree in university" is first found late 14c.; as is that of "medical professional," though this was not common till late 16c. Verb sense of "alter, disguise, falsify" is first recorded 1774. Related: Doctored; doctoring.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

doctor doc·tor (dŏk'tər)

  1. A person, especially a physician, dentist, or veterinarian, trained in the healing arts and licensed to practice.

  2. A person who has earned the highest academic degree awarded by a university in a specified discipline.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Bible Dictionary

Doctor definition

(Luke 2:46; 5:17; Acts 5:34), a teacher. The Jewish doctors taught and disputed in synagogues, or wherever they could find an audience. Their disciples were allowed to propose to them questions. They assumed the office without any appointment to it. The doctors of the law were principally of the sect of the Pharisees. Schools were established after the destruction of Jerusalem at Babylon and Tiberias, in which academical degrees were conferred on those who passed a certain examination. Those of the school of Tiberias were called by the title "rabbi," and those of Babylon by that of "master."

Easton's 1897 Bible Dictionary
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