1. A microscopic particle smaller than 100nm

Encyclopedia: Nanoparticle

• watering pot
• waterish
• waterleaf
• waterleaf family
• waterless
• waterlessness
• waterline
• waterlogged
• waterloo
• waterman
• watermark
• watermeal
• watermelon
• watermelon begonia
• watermelon vine
• watermelon-shaped
• waterpower
• waterproof
• waterproofed
• waterproofing
• waters
• waterscape
• watershed
• waterside
• waterskier