preventive

[pri-ven-tiv]
adjective
1.
Medicine/Medical. of or noting a drug, vaccine, etc., for preventing disease; prophylactic.
2.
serving to prevent or hinder: preventive measures.
noun
3.
Medicine/Medical. a drug or other substance for preventing disease.
4.
a preventive agent or measure.
Also, preventative [pri-ven-tuh-tiv] , (for defs 2, 4).


Origin:
1630–40; prevent + -ive

preventively, adverb
preventiveness, noun
nonpreventive, adjective
nonpreventively, adverb
nonpreventiveness, noun
unpreventative, adjective
unpreventive, adjective
unpreventively, adverb
unpreventiveness, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
preventive (prɪˈvɛntɪv, prɪˈvɛntətɪv)
 
adj
1.  tending or intended to prevent or hinder
2.  med
 a.  tending to prevent disease; prophylactic
 b.  of or relating to the branch of medicine concerned with prolonging life and preventing disease
3.  (in Britain) of, relating to, or belonging to the customs and excise service or the coastguard
 
n
4.  something that serves to prevent or hinder
5.  med any drug or agent that tends to prevent or protect against disease
6.  another name for contraceptive
 
pre'ventively
 
adv
 
pre'ventiveness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

preventive pre·ven·tive (prĭ-věn'tĭv) or pre·ven·ta·tive (-tə-tĭv)
adj.
Preventing or slowing the course of an illness or a disease; prophylactic. n.
A preventive agent or treatment.

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
It's about finding the right combination of preventative medications and
  working with a good headache specialist.
Yet few governments are willing to spend even fractions of that on preventative
  maintenance.
The researchers caution that red wine cannot be considered a cancer
  preventative.
Their work is an important part of preventative health care.
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