1. Steel with a surface that is much harder than the interior metal

Type of: steel

• indefeasible
• indefectible
• indefensible
• indefensibly
• indefinable
• indefinably
• indefinite
• indefinite article
• indefinite integral
• indefinite quantity
• indefinitely
• indefiniteness
• indefinity
• indehiscence
• indehiscent
• indelibility
• indelible
• indelible ink
• indelibly
• indelicacy
• indelicate
• indemnification
• indemnify
• indemnity
• indemonstrable