preventive Definition

1. Tending or intended to prevent or hinder.

Thesaurus: obstructive, deterrent, shielding, preventative, impeding, inhibitory, precautionary, counteractive, hampering, hindering, protective; Antonym: causative, fostering.
2. medicine.
Tending or intended to prevent disease or illness.
3. In the UK: relating or belonging to the Coastguard or the department of Customs and Excise dealing with the prevention of smuggling.

1. A preventive drug.
2. A precautionary measure taken against something.

Thesaurus: obstacle, shield, obstruction, impediment, block, deterrent, protection, safeguard, remedy, prevention, hindrance.