Medicine/Medical. a drug or other substance for preventing disease.
a preventive agent or measure.
Also pre·vent·a·tive [pri-ven-tuh-tiv] /prɪˈvɛn tə tɪv/ (for defs 2, 4).
Origin of preventive
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
tending or intended to prevent or hinder
- tending to prevent disease; prophylactic
- of or relating to the branch of medicine concerned with prolonging life and preventing disease
(in Britain) of, relating to, or belonging to the customs and excise service or the coastguard
Also (except for sense 3): preventative (prɪˈvɛntətɪv)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Online Etymology Dictionary, © 2010 Douglas Harper
Preventing or slowing the course of an illness or disease; prophylactic.
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.