1. The part of the Earth's surface covered by frozen water (e.g. ice caps, glaciers, etc)

Encyclopedia: Cryosphere

• oblate
• oblateness
• oblation
• obligate
• obligate anaerobe
• obligated
• obligation
• obligational
• obligato
• obligatorily
• obligatory
• oblige
• obliged
• obligee
• obliger
• obliging
• police constable
• police court
• police cruiser
• police department
• police detective
• police dog
• police force
• police headquarters
• police investigation