2 Corrected the quotation from Brooks, and added two links, some formatting, and two tags.
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According to The TeXbookThe TeXbook [Don Knuth, 1984], solution to Exercise 14.8, the word eighteen should be hyphenated eight-teen. It is, indeed, standard practice in pre-reform German to contract triple consonants and have them re-appear when the word is hyphenated (e.g., SchiffahrtSchiff-fahrt) but this is the only such case I heard about in English. The Dictionary of the British English Spelling SystemDictionary of the British English Spelling System [Greg Brooks, 2015] has this at §4.4.7 says that “one might have expected eightteen, but it is always reduced toExtensions eighteen(1):

Given ... sixth, seventh, ...sixteen, seventeen ... and sixty, seventy ..., one might have expected eightth, eightteen, eightty, but these are always reduced to eighth, eighteen, eighty.”

Nevertheless, nevertheless there is no mention of hyphenation.

My questions are:

  1. haveHave you ever noticed hyphenation of eighteen as eight-teen in some document?
  2. doDo you know of any other words requiring similar treatment?

According to The TeXbook [Don Knuth, 1984], solution to Exercise 14.8, the word eighteen should be hyphenated eight-teen. It is, indeed, standard practice in pre-reform German to contract triple consonants and have them re-appear when the word is hyphenated (e.g., SchiffahrtSchiff-fahrt) but this is the only such case I heard about in English. The Dictionary of the British English Spelling System [Greg Brooks, 2015] §4.4.7 says that “one might have expected eightteen, but it is always reduced to eighteen, nevertheless there is no mention of hyphenation.

My questions are:

  1. have you ever noticed hyphenation of eighteen as eight-teen in some document?
  2. do you know of any other words requiring similar treatment?

According to The TeXbook [Don Knuth, 1984], solution to Exercise 14.8, the word eighteen should be hyphenated eight-teen. It is, indeed, standard practice in pre-reform German to contract triple consonants and have them re-appear when the word is hyphenated (e.g., SchiffahrtSchiff-fahrt) but this is the only such case I heard about in English. The Dictionary of the British English Spelling System [Greg Brooks, 2015] has this at §4.4.7, Extensions (1):

Given ... sixth, seventh, ...sixteen, seventeen ... and sixty, seventy ..., one might have expected eightth, eightteen, eightty, but these are always reduced to eighth, eighteen, eighty.”

Nevertheless, there is no mention of hyphenation.

My questions are:

  1. Have you ever noticed hyphenation of eighteen as eight-teen in some document?
  2. Do you know of any other words requiring similar treatment?
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Other special hyphenation examples than eight-teen

According to The TeXbook [Don Knuth, 1984], solution to Exercise 14.8, the word eighteen should be hyphenated eight-teen. It is, indeed, standard practice in pre-reform German to contract triple consonants and have them re-appear when the word is hyphenated (e.g., SchiffahrtSchiff-fahrt) but this is the only such case I heard about in English. The Dictionary of the British English Spelling System [Greg Brooks, 2015] §4.4.7 says that “one might have expected eightteen, but it is always reduced to eighteen”, nevertheless there is no mention of hyphenation.

My questions are:

  1. have you ever noticed hyphenation of eighteen as eight-teen in some document?
  2. do you know of any other words requiring similar treatment?