ossified (adj.)

• backed
• bone
• bony
• callous
• calloused
• case-hardened
• crusted
• crusty
• crystallized
• fossilized
• granulated
• hardened
• indurate
• osseous
• ossicular
• ossiferous
• osteal
• reinforced
• sclerotic
• set
• solidified
• strengthened
• toughened
• vitrified