noun
: an atmospheric layer at heights of about 20 to 30 miles (32 to 48 kilometers) which is normally characterized by high ozone content that blocks most solar ultraviolet radiation from entry into the lower atmosphere
noun
: an atmospheric layer at heights of about 20 to 30 miles (32 to 48 kilometers) which is normally characterized by high ozone content that blocks most solar ultraviolet radiation from entry into the lower atmosphere
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012