halitophobia
n.— «At the organization’s recent global conference, halitophobia—also known as delusional halitosis or imagined bad breath—was identified as a vital area for future mouth malodour research.» —“Bad breath? Forget gum, you might need a shrink” by Misty Harris Times Colonist (Victoria, British Columbia, Canada) Oct. 11, 2007. (source: Double-Tongued Dictionary)
Further reading
Language is always evolving, and that’s also true for American Sign Language. A century ago, the sign for “telephone” was one fist below your mouth and the other at your ear, as if you’re holding an old-fashioned candlestick...
We use the term Milky Way for that glowing arc across the sky. But how people picture it varies from culture to culture. In Sweden, that starry band goes by a name that means “Winter Street,” and in Hawaii, a term for the Milky Way...