That’s correct, but what’s your point? A visiting professor is not an adjunct. A visiting professor is typically an associate or full professor from another academic institution, brought in on a full-time but temporary basis either to fill a particular short-term teaching need (e.g., during the absence of a permanent member of the faculty due to a sabbatical or other leave), or for enrichment purposes because the visiting professor is doing research of interest to or in collaboration with one or more full-time members of the faculty, or as a “look-see” who is being considered for a potential lateral offer to join the faculty on a permanent basis. A visiting professor is typically paid at whatever professional salary and benefits they were earning at their home institution, and they retain their appointment at their home institution to which they have rights to return upon completion of the visit.
An adjunct is typically not a full-time faculty member at another academic institution but is hired on a temporary basis strictly for the purpose of teaching one or more classes, usually with no path to a permanent, full-time faculty position. An adjunct is paid on a per-class basis, essentially a kind of academic piece-work, usually at a fairly low rate and usually without benefits.