1. Indistinctly crystalline; - applied to rocks and minerals, whose state of aggregation is so fine that no distinct particles are visible, even under the microscope

Encyclopedia: Cryptocrystalline

• iron trap
• iron-gray
• iron-grey
• iron-storage disease
• iron-tree
• ironclad
• ironed
• ironic
• ironical
• ironically
• ironing
• ironing board
• ironist
• ironlike
• ironman
• ironmaster
• ironmonger
• ironmonger's shop
• ironmongery
• irons
• ironshod
• ironside
• Ironsides
• ironstone
• ironware