1. A hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantalite
   - tantalum, Ta

Type of: metal, metallic element

Part of: columbite, fergusonite, niobite, tantalite

• defense laboratory
• defense lawyer
• defense lawyers
• Defense Logistics Agency
• defense mechanism
• defense policy
• defense program
• defense reaction
• Defense Reutilization and Marketing Service
• Defense Secretary
• defense system
• defense team
• Defense Technical Information Center
• defenseless
• defenselessly
• defenselessness
• defenseman
• defensibility
• defensible
• defensive
• defensive attitude
• defensive measure
• defensive structure
• defensively
• defensiveness