1. A polyvalent metallic element that resembles chromium and tungsten in its properties; used to strengthen and harden steel
   - molybdenum, Mo

Type of: metal, metallic element

Part of: molybdenite

• off your guard
• off-and-on
• off-axis reflector
• off-base
• off-Broadway
• off-center
• off-centered
• off-centre
• off-centred
• off-color
• off-colour
• off-day
• off-guard
• Robert's Rules of Order
• Roberto Francesco Romolo Bellarmine
• Roberts
• Robertson
• Robeson
• Robespierre
• robin
• Robin Goodfellow
• Robin Hood
• robin redbreast
• robin's plantain
• Robinia