Hyphens, En Dashes, Em Dashes

Q. I am editing a collection of poems. My poet is inclined to use ellipses and em dashes extensively and incorrectly. I argued that this will detract from the manuscript and be distracting for readers. She argued that it’s a style thing and I shouldn’t change it. Who is right? Does the poet get complete license?

Q. For Chicago style, is there a mandate on whether a paper clip or staple should be used?

Q. Dear CMOS: My author uses 9/11 as a shorthand to refer to the September 11 attacks. When this is being used in the phrase “post-9/11 world,” wouldn’t an en dash be more appropriate than a hyphen because post has to bridge 9/11, which is shorthand for two words?

Q. Hello, I've tried to grasp the rule on hyphenating a couple of words I'm confronted with; could you please confirm I'm right in my reasoning: nontoxic (“non-toxic” would look better); nonsmokers (“non-smokers” would look better); noneicosanoid functions (“non-eicosanoid” would look better; nonphosphorylated form (“non-phosphorylated” would look better).

Q. I’m seeing this particular use of hyphens: low-to-moderate income families. I don’t think it’s correct, but it’s becoming so common that I’m beginning to wonder if I missed something.

Q. I was not able to find this in CMOS anywhere: how do you hyphenate a word that has both a prefix and a suffix? For example, should “seminationwide” have any hyphens?

Q. Should “64 Slice Cardiac Computed Tomography Angiography Program” be hyphenated “64-Slice”?

Q. Obviously, two adjectives separated by “and” need not be hyphenated, as in “Brackett Omensetter was a wide and happy man.” But how about suspended compound nouns, for example, “city- and state government” or a musician’s “recording- and practice space”? Need the first modifier have a suspended hyphen? I vote hyphen, myself, but I’ve been called to account and could find neither backup nor smackdown in the Chicago Manual.

Q. Please help. Does “blue black berries” require a hyphen? What about “deep violet blue color”? We’ve had to look beyond CMOS for guidance because the issue of compound color modifiers isn’t thoroughly covered, although as CMOS is our primary reference, we would happily defer to you. Many of our publications include compound color modifiers, and it’s become a bit tense around here as some insert hyphens and others remove them.

Q. My question relates to commonly used Latin terms. Does one hyphenate if the phrase is used as a compound modifier? Examples: “The board has four ex officio members.” “Ad hoc committee members do not participate in executive sessions.”