a quantity of medicine prescribed to be taken at one time.
a substance, situation, or quantity of anything analogous to medicine, especially of something disagreeable: Failing the exam was a hard dose to swallow.
an amount of sugar added in the production of champagne.
Also called absorbed dose. the quantity of ionizing radiation absorbed by a unit mass of matter, especially living tissue: measured in gray or rad.
Slang. a case of gonorrhea or syphilis.
verb (used with object), dosed, dosing.
to administer in or apportion for doses.
to give a dose of medicine to.
to add sugar to (champagne) during production.
verb (used without object), dosed, dosing.
to take a dose of medicine.

1590–1600; earlier dos < Late Latin dosis < Greek dósis a giving

doser, noun
superdose, noun
underdose, noun
underdose, verb (used with object), underdosed, underdosing.
well-dosed, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dose (dəʊs)
1.  med a specific quantity of a therapeutic drug or agent taken at any one time or at specified intervals
2.  informal something unpleasant to experience: a dose of influenza
3.  Also called: dosage the total energy of ionizing radiation absorbed by unit mass of material, esp of living tissue; usually measured in grays (SI unit) or rads
4.  Also called: dosage a small amount of syrup added to wine, esp sparkling wine, when the sediment is removed and the bottle is corked
5.  slang a venereal infection, esp gonorrhoea
6.  like a dose of salts very quickly indeed
7.  to administer a dose or doses to (someone)
8.  med to give (a therapeutic drug or agent) in appropriate quantities
9.  (often foll by up) to give (someone, esp oneself) drugs, medicine, etc, esp in large quantities
10.  to add syrup to (wine) during bottling
[C15: from French, from Late Latin dosis, from Greek: a giving, from didonai to give]

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.1600, from M.Fr. dose, from L.L. dosis, from Gk. dosis "a portion prescribed," lit. "a giving," used by Galen and other Gk. physicians to mean an amount of medicine, from didonai "to give" (see date (1)). Slang meaning "venereal disease" is from 1914.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

dose (dōs)
Abbr. D.

  1. A specified quantity of a therapeutic agent, such as a drug, prescribed to be taken at one time or at stated intervals.

  2. The amount of radiation administered as therapy to a given site.

v. dosed, dos·ing, dos·es
  1. To give or prescribe something, such as medicine, in specified amounts.

  2. To give someone a dose, as of medicine.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
They have shown that which circuit is activated depends not only on the type of
  receptor a drug acts on, but also the dose given.
Patients with a mild version of the disease who took a high dose of the drug
  had a slower rate of decline than those who did not.
The worm is then funnelled into an incubation well and exposed to a dose of the
  potential drug.
Honesty, the ability to demonstrate a broad set of skills, and a healthy dose
  of self-awareness can go a long way in helping.
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