If undergraduate Honor's Thesis printed/shelved in Alma-metar's library & checked out a number of times -- does it count as "published" on a CV?
Any work that has been made publicly accessible in an archival manner can safely be considered published (along with some that are a bit more tenuous).  That includes all manner of theses, whether or not anybody is actually reading or citing them.  Thus, you should definitely list it in your CV as part of your publications.

In a typical academic CV, however, publications are separated into different categories.  How many categories depends on the particulars of one's field and record, but it typically at least divides into peer-reviewed (e.g., journal articles) and non-peer-reviewed (e.g., your thesis).  I would further recommend having a specific category for large non-peer-reviewed works like your thesis (on my own CV, it's "Book Chapters and Theses"), to distinguish them from smaller tech reports, abstracts, and the like.