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


Is Slavic [zima] (“winter”) derived from “snow”?How does Gk. “hieros” differ from its cognate Gk. “oistros” with an “h”?Why is the Lao word for tea “ຊາ” (saa) and not “ຈາ” (chaa)?Is دشمن (“enemy” in Persian) borrowed from δυσμενής (“hostile” in ancient Greek)?connection between Castor (one of the Διόσκουροι) and the animal (beaver)?Where does the word “kitsch” come from?How does the prefix 'entre' in French's 'entreprendre' compare with the prefix 'under-' in English's 'undertake'?Why does word-initial upsilon always have a rough breathing?Why does Greek have 'aorgesia' and 'aorist' rather than 'anorgesia' and 'anorist'?“yotta” in Greek and Armenian






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1















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
































    1















    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




























      1












      1








      1








      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






      share|improve this question















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      edited 9 hours ago







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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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            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































              4















              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





























                4














                4










                4









                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








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