a. A specified quantity of a therapeutic agent, such as medicine, prescribed to be taken at one time or at stated intervals.
b. The amount of radiation administered as therapy to a given site.
2. An ingredient added, especially to wine, to impart flavor or strength.
3. An amount, especially of something unpleasant, to which one is subjected: a dose of hard luck.
4. Slang A venereal infection.
tr.v. dosed, dos·ing, dos·es
1. To give (someone) a dose, as of medicine.
2. To give or prescribe (medicine) in specified amounts.
[French, from Late Latin dosis, from Greek, something given, from didonai, to give; see dō- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The American Heritage Dictionary Blog
Check out our blog, updated regularly, for new words and revised definitions, interesting images from the 5th edition, discussions of usage, and more.