Diccionario lengua Española : Secundaria y Bachillerato
Grupo Edebé(2005)
Has over 30,000 headwords with full definitions indicating correct usage in spoken and written Spanish.
It covers the vocabulary used in the various fields of education, maths, geography, history, physics, etc.
Includes the vocabulary used in science and technology as well as e-mail and mobile phone communication and slang.
SP DICO 7 Open access