Key takeaways

  • The final t of Diderot is silent in French and in English.
  • American dictionaries list both dee-duh-ROH and DEE-duh-roh; either is correct, and dee-duh-ROH is closer to the French rhythm.
  • In French the middle vowel is often swallowed, so the name sounds close to dee-DROH.

Diderot is a French name, and the most important thing to know is what to leave out: the final t is silent.

In French

The French pronunciation is written [did(ə)ʁo] in phonetic spelling. That is three syllables, di-de-rot, but the middle vowel is so light that it often disappears, and the name comes out close to dee-DROH. The r is the French one, made at the back of the throat, and no syllable gets a heavy stress; the slight weight falls on the last one. His full name, Denis Diderot, sounds roughly like duh-NEE dee-DROH.

In American English

Most English speakers keep all three syllables. American dictionaries record two stress patterns, and both are correct:

  • dee-duh-ROH, with the stress on the last syllable, which keeps closest to the French rhythm. This is the one we use.
  • DEE-duh-roh, with the stress on the first syllable, which is also the usual British form.

Merriam-Webster also lists the more French dee-DROH. Whichever you choose, the vowels stay the same: “dee” as in deep, a soft “duh,” and “roh” as in row a boat.

Common mistakes

  • Sounding the t. “DID-er-ot” or “dee-duh-ROT” is the most common slip.
  • An English “i.” “DIE-der-oh” treats the first vowel as in diet. It is “dee.”
  • Stress in the middle. “dih-DARE-oh” sounds Italian, not French.
  • The possessive. Diderot’s essay is “dee-duh-ROHZ essay.” The s is said, the t still is not.

The Diderot effect, said aloud

Put together, it is the dee-duh-ROH effect. You will also see the same idea called the “Diderot syndrome.” The two names mean the same thing; “effect” is the term that research uses.

What the name means

The name belongs to Denis Diderot (1713 to 1784), the French philosopher and writer who edited the Encyclopédie, one of the great works of the Enlightenment. His short essay about a new scarlet dressing gown, written in 1769, gave the effect its name. Our page on where the effect comes from has the full story, and our translation of the essay starts with the robe itself.

What the effect means

The Diderot effect is the pull that one new possession exerts on the things around it: they start to look shabby or mismatched beside it, and replacing them sets off a chain of further purchases. The hub page explains why it happens and how to stop it, and our collection of lines from the essay shows how Diderot described it himself.

Questions readers ask

Is the t in Diderot silent?

Yes. Like most final consonants in French, the t is not pronounced. The name ends on an "oh" sound, as in "go."

Is it the Diderot effect or the Diderot syndrome?

They mean the same thing. "Diderot effect" is the name the anthropologist Grant McCracken gave it in 1988 and the one used in research. "Diderot syndrome" is a looser label some writers use for the same pattern.

How do you say his first name, Denis?

In French it is duh-NEE, with the stress at the end and the s silent. Many English speakers say it like the English name Dennis, which is understandable but not French.

Sources

  1. Diderot (Merriam-Webster) Gives dee-DROH and DEE-duh-roh.
  2. Diderot (Dictionary.com) Gives DEE-duh-roh and dee-duh-ROH for American English, and the British and French forms.
  3. Diderot (Collins English Dictionary) British and American pronunciations, with the French.
  4. Denis Diderot (Wikipedia) The French pronunciation in the International Phonetic Alphabet, and his dates.
  1. The Diderot effect, explained

    The Effect: One new thing makes everything around it look shabby, so you buy more. Where the idea comes from, why it works on nearly everyone, and how to stop it.

  2. Where the Diderot effect comes from: the robe, the essay and the name

    The Effect: A philosopher who was poor until an empress bought his books, a salon hostess who refurnished his study, an essay passed around Europe's courts, and an anthropologist who named it two centuries later.

  3. Diderot effect quotes: the lines from the essay people repeat

    The Effect: The master and the slave, the room out of tune, the corner that asked for a cabinet. Twelve passages from the essay, in our own translation, and what each one says to anyone about to buy something new.

  4. The old robe and the new

    The Essay: Diderot mourns the shapeless old gown that fit him like a second skin, and discovers that the splendid new one has made him its servant.

Page history: first published .