prophylactic (n.)
- aegis
- antacid
- antidote
- antiseptic
- backstop
- bag
- buffer
- bulwark
- bumper
- condom
- contraceptive
- copyright
- counterirritant
- covering
- cushion
- dashboard
- defensive
- deterrent
- diaphragm
- dodger
- fender
- forbidding
- forestalling
- fostering
- fuse
- goggles
- governor
- guard
- guardian
- guardrail
- handrail
- helmet
- insulation
- interlock
- lifeline
- mask
- mudguard
- nullifier
- offset
- pad
- padding
- palladium
- patent
- pessary
- pilot
- preventative
- preventive
- remedy
- rubber
- safeguard
- safety
- screen
- screening
- shield
- shielding
- skin
- spermicide
- umbrella
- windscreen
- windshield
prophylactic (adj.)
- antacid
- antiseptic
- aseptic
- bag
- boiled
- bumper
- contraceptive
- counteractive
- covering
- custodial
- defensive
- deterrent
- discouraging
- forbidding
- fuse
- guard
- hygienic
- mask
- parental
- pasteurized
- patent
- preclusive
- preventative
- preventive
- prohibitive
- protecting
- protective
- rubber
- sanitary
- screen
- sterile
- sterilized
- tutelary
- umbrella
- uninfected
- vigilant
- watchful
