(chemistry) Any oxide of the elements of group II of the periodic table; they are not as basic as the alkalis, and not so soluble in water.

Alternative spelling of alkaline earth

(North American countries) April 22; Created in 1970, global day of observance of the need to protect the earth. / (obsolete, US) March 21st.

(idiomatic) Practical; realistic; pragmatic. / (idiomatic) Ordinary; normal; run-of-the-mill.

(idiomatic) A very unpleasant situation; torment, particularly when widespread.

(fiction) The main setting of J.R.R. Tolkien's Lord of the Rings and other works. / Alternative form of Middle Earth: the Earth.

(chemistry) Any of the naturally occurring oxides of the lanthanide metals; they are widely distributed in relatively small concentrations and are used in glassmaking, ceramic glazes etc.

A red soil found in tropical areas, containing oxidized iron.

Alternative form of Middle Earth: (archaic) the Earth; (Norse mythology) Midgard. / (fiction) Alternative letter-case form of Middle-earth: the setting of the Lord of the Rings mythos.

The United Nations Conference on Environment and Development held in Rio de Janeiro in 1992.