1. extremely fine or small in size, texture, or detail

Examples

• The ultrafine particles in the air pollution were barely visible.
• She used ultrafine sandpaper to smooth the wood surface.
• The ultrafine powder dissolved instantly in water.
• The artist drew with an ultrafine pen to create intricate details.
• Ultrafine fibers make the fabric incredibly soft.
• The ultrafine mesh filtered out even the smallest impurities.