hornstone
noun
horn·stone ˈhȯrn-ˌstōn 
: a mineral that is a variety of quartz much like flint but more brittle
Word History
First Known Use
1728, in the meaning defined above
- overproportioned
- overproportioning
- overproportions
- overprotect
- overprotected
- overprotecting
- overprotection
- overprotections
- overprotective
- overprotectiveness
- overprotectivenesses
- overprotects
- overprove
- overpump
- overpumped
- overpumping
- overpumps
- overqualified
- overquick
- overquickly
- overracked
- overracking
- overracks
- overraked
- overrakes