noun
Usage: usually capitalized D
Etymology: after Gordon M.B. Dobson died 1976 British physicist
: a unit of atmospheric ozone content above a given spot on earth's surface
noun
Usage: usually capitalized D
Etymology: after Gordon M.B. Dobson died 1976 British physicist
: a unit of atmospheric ozone content above a given spot on earth's surface
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012