What does the prefix pseudo- mean?
Pseudo- comes from the Greek pseudos, which means "lie" or "falsehood". It shows something that seems to be what it is not, or that pretends to have properties it does not have.
ESEN
Prefix · false / pretending to be
pseudo-
Signals something false or pretending to be what it is not: pseudonym, pseudoscience, pseudocode.
Literary
Written by Bryan López, English teacher · Updated
Pseudo- invites doubt
In critical and literary language, pseudo- has a tone of imposture or deception: it describes something that looks like one thing without really being it. In computing it is also used for something that seems random but follows a rule. The idea is always the same: if something carries pseudo-, it is worth asking whether it is really what it claims to be.
How it is used
Attaches to nouns and adjectives:
- pseudo- + discipline/termscience → pseudosciencenym → pseudonymcode → pseudocodepod → pseudopod
- pseudo- + adjective/categoryintellectual → pseudo-intellectualdemocratic → pseudo-democraticrandom → pseudo-randomclassic → pseudoclassic
Pronunciation: /ˈsjuːdəʊ/. The initial "p" may be silent in informal speech.
How it is pronounced
pseudo-/ˈsjuːdəʊ/
Tap the button to hear how the prefix sounds. Each word in the table has its own audio.
Examples
Root word
With pseudo-
In a phrase
- nympseudonymGeorge Orwell was a pseudonym; his real name was Eric Blair.
- sciencepseudoscienceAstrology is pseudoscience because its claims cannot be tested empirically.
- codepseudocodeThe developer sketched the logic in pseudocode before writing any real code.
- intellectualpseudo-intellectualHe was a pseudo-intellectual who hid ignorance behind complex vocabulary.
- podpseudopodAn amoeba extends pseudopods to move and engulf food.
- randompseudo-randomComputers generate pseudo-random numbers that look random but are not.
- epigraphapseudepigraphaSome Dead Sea Scrolls are pseudepigrapha attributed to figures who never wrote them.
Common mistakes
pseudonym = a nickname
pseudonym = a name deliberately chosen for professional or literary use; a nickname is informal and usually given by others
"Pseudonym" = a name deliberately adopted for professional or published use (pen name, stage name): George Orwell (Eric Blair), Voltaire (François-Marie Arouet). A "nickname" is informal, usually given by others, often affectionate or humorous. Pseudonyms are formal and self-chosen; nicknames are informal and often imposed.
pseudoscience = any science that is new or controversial
pseudoscience = a discipline that claims to be scientific but does not follow the scientific method or cannot be empirically falsified
"Pseudoscience" includes astrology, homeopathy, and aura reading. What defines them is not being new or controversial (quantum physics was controversial) but that they cannot be falsified, make no verifiable predictions, or systematically ignore contradicting evidence.
A trick to remember it
Think of a pseudonym, a fake name: pseudo- = false. pseudonym, pseudoscience.
Practise what you learned
Exercise 1 · Form the word
Exercise 2 · Pick the right one
"Astrology is often cited as a ___ because its claims cannot be tested or disproved scientifically."
Exercise 3 · Pick the right one
What is the difference between a "pseudonym" and a "nickname"?
Frequently asked questions
What does the prefix pseudo- mean in English?
The prefix pseudo- signals something false or pretending to be what it is not: pseudonym, pseudoscience, pseudocode.
How do you pronounce pseudo-?
The prefix pseudo- is pronounced /ˈsjuːdəʊ/. For example, "pseudonym".
Can you give an example of a word with pseudo-?
"nym" becomes "pseudonym". It is a typical example of the pseudo- prefix.
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