Encyclopaedia

Encyclopaedia is the usual spelling in British English. In American English, it is spelled encyclopedia. The British spelling is more consistent, if not accurately so, with the etymology: the word is from late Latin encyclopædia. This in turn derives from the Greek ένκυκλοπαιδεíα, so should perhaps be rendered encyclopaidia;. But it isn't.

Dictionaries are "impoverished encyclopaedias" Eco, ???

an erroneous form (said to be a false reading) occurring in MSS. of Quintilian, Pliny, and Galen, for {elenis}{gamma}{kappa}{guacu}{kappa}{lambda}{iota}{omicron}{fsigma} {pi}{alpha}{iota}{delta}{epsilon}{giacu}{alpha} ‘encyclical education’, the circle of arts and sciences considered by the Greeks as essential to a liberal education