With common lenses the aperture is controlled by a mechanism called an "iris."
But, especially with cine/video-oriented lenses, I often see the term "iris" used as an apparent synonym for aperture. E.g., "smooth iris control."
Is there a reason they refer to "iris control" instead of "aperture control?" If a lens uses an iris for aperture control wouldn't that always be the same thing? Or, for example, are there other non-iris aperture controls in modern use so that it would make sense to specify that the aperture control on a particular lens is via iris?