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7.45: Text- Hyphens and Dashes

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    Hyphens

    hyphenThe Oxford Manual of Style once stated, “If you take hyphens seriously you will surely go mad.” Hyphens belong to that category of punctuation marks that will hurt your brain if you think about them too hard, and, like commas, people disagree about their use in certain situations. Nevertheless, you will have to use them regularly because of the nature of academic and professional writing. If you learn to use hyphens properly, they help you to write efficiently and concretely.

    The Hyphen’s Function

    Fundamentally, the hyphen is a joiner. It can join several different types of things:

    • two nouns to make one complete word (kilogram-meter)
    • an adjective and a noun to make a compound word (accident-prone)
    • two words that, when linked, describe a noun (agreed-upon sum, two-dimensional object)
    • a prefix with a noun (un-American)
    • double numbers (twenty-four)
    • numbers and units describing a noun (1000-foot face; a 10-meter difference)
    • “self” words (self-employed, self-esteem)
    • new word blends (cancer-causing, cost-effective)
    • prefixes and suffixes to words, in particular when the writer wants to avoid doubling a vowel or tripling a consonant (anti-inflammatory; shell-like)
    • multiple adjectives with the same noun (blue- and yellow-green beads; four- and five-year-olds)

    A rule of thumb for the hyphen is that the resulting word must act as one unit; therefore, the hyphen creates a new word that has a single meaning. Usually, you can tell whether a hyphen is necessary by applying common sense and mentally excluding one of the words in question, testing how the words would work together without the hyphen. For example, the phrases “high-pressure system,” “water-repellent surface,” and “fuel-efficient car” would not make sense without hyphens, because you would not refer to a “high system,” a “water surface,” or a “fuel car.” As your ears and eyes become attuned to proper hyphenation practices, you will recognize that both meaning and convention dictate where hyphens fit best.

    Examples of Properly Used Hyphens

    Some examples of properly used hyphens follow. Note how the hyphenated word acts as a single unit carrying a meaning that the words being joined would not have individually.

    small-scale study two-prong plug strength-to-weight ratio high-velocity flow frost-free lawn
    self-employed worker one-third majority coarse-grained wood decision-making process blue-green algae
    air-ice interface silver-stained cells protein-calorie malnutrition membrane-bound vesicles phase-contrast microscope
    long-term-payment loan cost-effective program time-dependent variable radiation-sensitive sample long-chain fatty acid

    When Hyphens Are Not Needed

    By convention, hyphens are not used after words ending in –ly, nor when the words are so commonly used in combination that no ambiguity results. In these examples, no hyphens are needed:

    finely tuned engine blood pressure sea level
    real estate census taker atomic energy
    civil rights law public utility plant carbon dioxide

    Note: Phrases like containing the word well like well known are contested. Well is an adverb, and thus many fall into the school of thought that a hyphen is unnecessary. However, others say that leaving out the hyphen may cause confusion and therefore include it (well-known). The standard in MLA is as follows: When it appears before the noun, well known should be hyphenated. When it follows the noun, no hyphenation is needed.

    • She is a well-known person.
    • She is well known.

    Prefixes and Suffixes

    Most prefixes do not need to be hyphenated; they are simply added in front of a noun, with no spaces and no joining punctuation necessary. The following is a list of common prefixes that do not require hyphenation when added to a noun:

    after anti bi bio co
    cyber di down hetero homo
    infra inter macro micro mini
    nano photo poly stereo thermo

    Note: The prefix re generally doesn’t require a hyphen. However, when leaving out a hyphen will cause confusion, one should be added. Look at the following word pairs, for example:

    • resign (leave a position) v. re-sign (sign the paper again)
    • recreation (an activity of leisure) v. re-creation (create something again)

    Common suffixes also do not require hyphenation, assuming no ambiguities of spelling or pronunciation arise. Typically, you do not need to hyphenate words ending in the following suffixes:

    able less fold like wise

    Commonly Used Word Blends

    Also, especially in technical fields, some words commonly used in succession become joined into one. The resulting word’s meaning is readily understood by technical readers, and no hyphen is necessary. Here are some examples of such word blends, typically written as single words:

    blackbody groundwater airship
    downdraft longwall upload
    setup runoff blowout

    Practice

    1. Students can participate in (self paced/self-paced) learning.
    2. Rather than sit in a (two hour-long/two-hour long/two-hour-long) class, students can study at their convenience.
    3. Would you like the (three or four-course/three- or four-course) meal tonight?
    4. He’s behaving in a very (childlike/child-like) manner.

    [reveal-answer q=”326425″]Click to Show Answers[/reveal-answer]
    [hidden-answer a=”326425″]

    1. Students can participate in self-paced learning.
    2. Rather than sit in a two-hour-long class, students can study at their convenience.
    3. Would you like the three- or four-course meal tonight?
    4. He’s behaving in a very childlike manner.

    [/hidden-answer]

    Dashes

    an icon showing an em dash, which is a straight line approximately the length of the letter m.The dash functions almost as a colon does in that it adds to the preceding material, but with extra emphasis. Like a caesura (a timely pause) in music, a dash indicates a strong pause, then gives emphasis to material following the pause. In effect, a dash allows you to redefine what was just written, making it more explicit. You can also use a dash as it is used in the first sentence of this paragraph: to frame an interruptive or parenthetical-type comment that you do not want to de-emphasize.

    • Jill Emery confirms that Muslim populations have typically been ruled by non-Muslims—specifically Americans, Russians, Israelis, and the French.
    • The dissolution took 20 minutes—much longer than anticipated—but measurements were begun as soon as the process was completed.
    There is no “dash” button on a computer keyboard. Instead, create it by typing the hyphen button twice in a row; or use the “symbol” option in your word processor; or use the Mac shortcut option + shift + —.

    When you type the hyphen or dash, no spaces should appear on either side of the punctuation mark.

    Practice

    Is the dash used correctly in the following sentences?

    1. A good leader should be—passionate, patient, productive and positive.
    2. Politicians want to serve and improve the lives of people—really!
    3. Life is ninety per cent perspiration—my kindergarten teacher told me—and ten per cent inspiration.
    4. Mayor Lee wants all city employees to ride bicycles to work—what is he thinking—on fair-weather days.

    [reveal-answer q=”624972″]Click to Show Answers[/reveal-answer]
    [hidden-answer a=”624972″]

    1. Incorrect. Normally, a noun precedes the series of examples: A good leader has several qualities — passion, patience and positivity.
    2. Correct. A dash can join a short affirmation of what has just been said. [Really! Truly! Indeed!]
    3. Correct. Dashes can be used to mark a sudden break in thought.
    4. Correct. Though very informal, dashes can be used for sudden breaks in thought. Note that the comment is very loosely related to the central idea of the sentence.

    [/hidden-answer]

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