Hyphenation exception list As of 10 January 2021 901 Hyphenation exception log least partly a matter of personal taste, an author should think of the reader when deciding whether Barbara Beeton or not to permit just one more breakpoint in some This is the periodic update of the list of words that obscure or confusing word. There really are times TEX fails to hyphenate properly. The full list last when a bit of rewriting is preferable. appeared in TUGboat 16:1, starting on page 12.1 One other warning: Some words can be more The full list is presented here, including some later than one part of speech, depending on context, and additions not yet published in TUGboat. Owing have different hyphenations; for example, `analyses' to the length of the list, it has been subdivided can be either a verb or a plural noun. If such a word into three parts: English words, names and non- appears in this list, hyphens are shown only for the English words (including transliterations from Cyril- portions of the word that would be hyphenated in lic and other non-Latin scripts) that occur in English the same way regardless of usage. These words are texts, and words specific to chemistry and related marked with a `*'; additional hyphenation points, if disciplines. The rationale for the last group is that needed in your document, should be inserted with this vocabulary is common internationally, and the discretionary hyphens. hyphenation (since it is based on etymology) is likely Words added since the last appearance of the + to be the same or very similar regardless of language, list are preceded by ` '. allowing this material to be reused easily. The reference used to check these hyphenations This list is specific to the hyphenation patterns is Webster's Third New International Dictionary, that appear in the original hyphen.tex, that is, the unabridged. Boundless thanks to Win Treese, lover patterns for U.S. English. Regarding patterns for of dictionaries, and owner of the paper edition of other languages, see below, \Hyphenation for lan- the Third, who has checked items since I lost access guages other than U.S. English". to the copy at AMS on my retirement and those at In the list below, the first column gives results libraries closed on account of the coronavirus. from plain TEX's \showhyphens{...}. The entries in the second column are suitable for inclusion in a Hyphenation for languages \hyphenation{...} list. other than U.S. English In most instances, inflected forms are not shown Patterns now exist for many languages other than for nouns and verbs, though all forms must be spec- U.S. English, including languages using accented and ified in a \hyphenation{...} list if they occur in non-Latin alphabets. CTAN holds an extensive col- your document. The machine-usable file mentioned lection of patterns: see language/hyphenation and below includes all forms. its subdirectories. Thanks to all who have submitted entries to the A group of volunteers led by Mojca Miklavec list. Since some suggestions have demonstrated a have created a comprehensive package of hyphen- lack of familiarity with the rules of the hyphenation ation patterns, called hyph-utf8; see algorithm, here is a short reminder of the relevant id- https://tug.org/tex-hyphen. iosyncrasies. Hyphens will not be inserted before the number of letters specified by \lefthyphenmin, nor Machine-usable exception list after the number of letters specified by \righthy- phenmin. For U.S. English, \lefthyphenmin=2 and Werner Lemberg has created scripts to convert this \righthyphenmin=3; thus no word shorter than five article into a machine-readable \hyphenation block letters will be hyphenated. (For the details, see The that can be incorporated into a document either TEXbook, page 454.) This particular rule is violated directly or by inputting a file. Many inflected forms in some of the words listed; however, if a word is will be included automatically, some evident in the hyphenated correctly by TEX except for \missing" printed version, but many included silently. Both hyphens at the beginning or end, it has generally shell and Perl versions of the script are available not been included here. (for no particular reason), with identical behavior. Some other permissible hyphens have been omit- Everything is available on CTAN at ctan.org/pkg/ ted for reasons of style or clarity. While this is at hyphenex. The TEX-usable output is in that direc- tory as the file ushyphex.tex, and in the TEX Live package hyphenex. 1 Updates appear in TUGboat 22(1/2):31{32; 23(3/4):247{248; 26(1):5{6; 29(2):239; 31(3):160; 33(1):5{6; The TEX-usable output of the script is posted 34(2):113{114; 36(1):5; 39(1):5{6; and 39(2):152. in the same area as ushyphex.tex.