'Pseudo-' has been English's standard prefix for 'false' since the 1300s — from 'pseudonym' to 'pseudoscience.'
A prefix meaning 'false,' 'sham,' 'pretended,' or 'deceptively resembling,' derived from Greek and used to form words indicating falseness, spuriousness, or misleading resemblance.
From Greek 'pseûdos' (ψεῦδος, falsehood, lie) and the related adjective 'pseudḗs' (ψευδής, false, lying), from the verb 'pseúdesthai' (ψεύδεσθαι, to lie, to cheat, to falsify), of uncertain deeper etymology. The prefix entered English earliest in 'pseudoprophet' and 'pseudoapostle' through biblical and theological texts, then expanded into scientific and general vocabulary to mark anything that resembles a genuine thing but is not. Key roots: pseûdos (ψεῦδος) (Greek: "falsehood, lie"), pseúdesthai (ψεύδεσθαι) (Greek: "to lie, to deceive
The Pseudepigrapha — ancient Jewish and Christian texts falsely attributed to biblical figures — take their name from Greek 'pseudepígraphos' (ψευδεπίγραφος, falsely inscribed/attributed), from 'pseûdos' (false) + 'epigráphein' (to inscribe). An entire genre of ancient religious literature is named for its defining characteristic: lying about who wrote it. The Book of Enoch, the Apocalypse of Abraham, and dozens of other texts are 'Pseudepigrapha' — writings that bear false names.
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