1. A soft yellow malleable ductile (trivalent and univalent) metallic element; occurs mainly as nuggets in rocks and alluvial deposits; does not react with most chemicals but is attacked by chlorine and aqua regia
   - gold, Au

Type of: noble metal

Part of: dental gold, gold, gold foil, gold leaf, graphic tellurium, sylvanite

• cottonwick
• cottonwood
• cottony
• cottony-white
• Cottrell precipitator
• Cottus
• Cotula
• Cotula coronopifolia
• Coturnix
• Coturnix communis
• Coturnix coturnix
• cotyledon
• cotyloid
• cotyloid cavity
• cotyloid joint
• cotyloidal
• coucal
• couch
• couch grass
• couch potato
• couchant
• couchette
• coudé system
• coudé telescope
• Coue