a punctuation mark (-) used between parts of a compound word or between the syllables of a word when the word is divided at the end of a line of text; dash
n. A punctuation mark (-) used to break a word between syllables at the end of a line or to separate the parts of a compound word. Word processing programs with sophisticated hyphenation capabilities recognize three types of hyphens: normal, optional, and nonbreaking. Normal hyphens, also called required or hard hyphens, are part of a word’s spelling and are always visible, as in long-term. Optional hyphens, also called discretionary or soft hyphens, appear only when a word is broken between syllables at the end of a line; they are usually supplied by the word processing program itself. Nonbreaking hyphens are always visible, like normal hyphens, but they do not allow a line break. See also hyphenation program.