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Why is “dyadic” the only word with the prefix “dy-”?


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I learned that the word "dyadic", a word opposed to monadic, is written with a y.



My etymology sources indicates it comes from "Dyad", which means "pair", "couple", "double". However, every other word I know with a "di-" prefix meaning "two" is written with an i. (Dioxyde, division, digram, ... The "bi-" prefix is now much more prevalent but every other case of "di-" I know uses an i)



Even in ancient Greek, there's a difference between the "δι-" prefix and the word "δυάς", they don't use the same letter, although they both come from the Greek word for "two".




  • Why is there a difference in spelling between the Greek word for two and the "di-" prefix?


  • Why does "dyadic" seem to be the only word that kept the y?



Note that this seems to date from ancient Greek, so as far as I know it also happens in every language that got these words from Greek, not just English.










share|improve this question



























  • There is also dyarchy and dyotheism, but you are right that there don't seem to be many such words.

    – user52673
    1 hour ago


















2















I learned that the word "dyadic", a word opposed to monadic, is written with a y.



My etymology sources indicates it comes from "Dyad", which means "pair", "couple", "double". However, every other word I know with a "di-" prefix meaning "two" is written with an i. (Dioxyde, division, digram, ... The "bi-" prefix is now much more prevalent but every other case of "di-" I know uses an i)



Even in ancient Greek, there's a difference between the "δι-" prefix and the word "δυάς", they don't use the same letter, although they both come from the Greek word for "two".




  • Why is there a difference in spelling between the Greek word for two and the "di-" prefix?


  • Why does "dyadic" seem to be the only word that kept the y?



Note that this seems to date from ancient Greek, so as far as I know it also happens in every language that got these words from Greek, not just English.










share|improve this question



























  • There is also dyarchy and dyotheism, but you are right that there don't seem to be many such words.

    – user52673
    1 hour ago














2












2








2








I learned that the word "dyadic", a word opposed to monadic, is written with a y.



My etymology sources indicates it comes from "Dyad", which means "pair", "couple", "double". However, every other word I know with a "di-" prefix meaning "two" is written with an i. (Dioxyde, division, digram, ... The "bi-" prefix is now much more prevalent but every other case of "di-" I know uses an i)



Even in ancient Greek, there's a difference between the "δι-" prefix and the word "δυάς", they don't use the same letter, although they both come from the Greek word for "two".




  • Why is there a difference in spelling between the Greek word for two and the "di-" prefix?


  • Why does "dyadic" seem to be the only word that kept the y?



Note that this seems to date from ancient Greek, so as far as I know it also happens in every language that got these words from Greek, not just English.










share|improve this question
















I learned that the word "dyadic", a word opposed to monadic, is written with a y.



My etymology sources indicates it comes from "Dyad", which means "pair", "couple", "double". However, every other word I know with a "di-" prefix meaning "two" is written with an i. (Dioxyde, division, digram, ... The "bi-" prefix is now much more prevalent but every other case of "di-" I know uses an i)



Even in ancient Greek, there's a difference between the "δι-" prefix and the word "δυάς", they don't use the same letter, although they both come from the Greek word for "two".




  • Why is there a difference in spelling between the Greek word for two and the "di-" prefix?


  • Why does "dyadic" seem to be the only word that kept the y?



Note that this seems to date from ancient Greek, so as far as I know it also happens in every language that got these words from Greek, not just English.







etymology prefixes






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edited 10 hours ago







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  • There is also dyarchy and dyotheism, but you are right that there don't seem to be many such words.

    – user52673
    1 hour ago



















  • There is also dyarchy and dyotheism, but you are right that there don't seem to be many such words.

    – user52673
    1 hour ago

















There is also dyarchy and dyotheism, but you are right that there don't seem to be many such words.

– user52673
1 hour ago





There is also dyarchy and dyotheism, but you are right that there don't seem to be many such words.

– user52673
1 hour ago










2 Answers
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The prefix δυ- is from δύω “two” < IE *duō. The prefix δι- is from δίς “twice” < IE *dwi- (the /w/ is lost in Greek). Both are common in Greek.



By the way: “division” is from Latin, not Greek.



There are lots of English words beginning with dyo- and dy-. I suggest you flick through any English dictionary.






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    What about the word "dynamic"?






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      2 Answers
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      7















      The prefix δυ- is from δύω “two” < IE *duō. The prefix δι- is from δίς “twice” < IE *dwi- (the /w/ is lost in Greek). Both are common in Greek.



      By the way: “division” is from Latin, not Greek.



      There are lots of English words beginning with dyo- and dy-. I suggest you flick through any English dictionary.






      share|improve this answer
































        7















        The prefix δυ- is from δύω “two” < IE *duō. The prefix δι- is from δίς “twice” < IE *dwi- (the /w/ is lost in Greek). Both are common in Greek.



        By the way: “division” is from Latin, not Greek.



        There are lots of English words beginning with dyo- and dy-. I suggest you flick through any English dictionary.






        share|improve this answer






























          7














          7










          7









          The prefix δυ- is from δύω “two” < IE *duō. The prefix δι- is from δίς “twice” < IE *dwi- (the /w/ is lost in Greek). Both are common in Greek.



          By the way: “division” is from Latin, not Greek.



          There are lots of English words beginning with dyo- and dy-. I suggest you flick through any English dictionary.






          share|improve this answer















          The prefix δυ- is from δύω “two” < IE *duō. The prefix δι- is from δίς “twice” < IE *dwi- (the /w/ is lost in Greek). Both are common in Greek.



          By the way: “division” is from Latin, not Greek.



          There are lots of English words beginning with dyo- and dy-. I suggest you flick through any English dictionary.







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited 8 hours ago

























          answered 10 hours ago









          fdbfdb

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              What about the word "dynamic"?






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                What about the word "dynamic"?






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                  What about the word "dynamic"?






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                  What about the word "dynamic"?







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                  answered 1 hour ago









                  Aaron PlocharczykAaron Plocharczyk

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