superfirm
adjective
su·per·firm ˌsü-pər-ˈfərm 
: extremely firm
superfirm mattresses
Word History
First Known Use
1928, in the meaning defined above
- dehwars
- dehydr-
- dehydrate
- dehydrated
- dehydrates
- dehydrating
- dehydration
- dehydrations
- dehydrator
- dehydrators
- dehydro
- dehydro-
- dehydrochlorinases
- dehydrochlorinate
- dehydrochlorinated
- dehydrochlorinates
- dehydrochlorinating
- dehydrochlorination
- dehydrochlorinations
- dehydrocholesterol
- dehydrocorticosterone
- dehydrocyclization
- dehydroepiandrosterone
- dehydrofreezing
- dehydrofrozen