Definition of term: Culacino

• A drink-ring or circular stain left when a book is used as a coaster for a drinking glass. A handy Italian term which has no one-word English equivalent (and, from the perspective of book people, one of the most useful terms to be found in Howard Rheingold's entertaining book They Have a Word for It: A Lighthearted Lexicon of Untranslatable Words and Phrases).

  Source: What bookdealers really mean. A dictionary by Tom Congalton and Dan Gregory (Between the Covers), with additions from other sources