1) Anovulant 2) Blockading 3) Clogging 4) Condom 5) Defensive 6) Deterrent 7) Frustrative 8) Healthful 9) Hindering 10) Impeding 11) Iud 12) Obstructive 13) Obviating 14) Pessary 15) Precautional 16) Precautionary 17) Preclusive 18) Preemptive 19) Preventive 20) Prohibitive 21) Prohibitory 22) Protective 1) Anticipatory 2) Blockading 3) Blocking 4) Clogging 5) Defensive 6) Deterrent 7) Frustrating 8) Frustrative 9) Hindering 10) Impeding 11) Obstructive 12) Obviating 13) Precautional 14) Precautionary 15) Preclusive 16) Preemptive 17) Preventive 18) Prohibitive 19) Prohibitory 20) Protective 21) Tending to prevent or hinder 
• (n.) That which prevents; -- incorrectly used instead of preventive.
A measure applied in anticipation of pest attack.
Pre·vent'a·tive noun That which prevents; -- incorrectly used instead of preventive . 
prevent, preventative 1. To cause something not to happen or to stop it from being done. 2. To be the reason why someone does not or cannot do a particular thing.
contributing to the hindrance of disease