A hyphen is a small horizontal line (-) used to join words together or to break words into syllables. It is used to show a connection or merger between two words or to make words easier to read and understand. Full definition
If the sheer number of hyphens in that sentence had you weak in the knees, don't worry: it's pretty simple stuff. (thatvideogameblog.com)
Using prefixes such post creates a compound adjective, as we discussed before, but in many instances, use of hyphens with prefixes is dying out. (creativeboom.com)
It's becoming more fashionable not to use hyphens for common prefixes like «pre -» or «cyber -», and meld them into one word, e.g. Notorious B.I.G. was the preeminent rapper of the late»90s. (creativeboom.com)