I think one lesson this thread teaches us is: do not use the word polyamory and assume people understand your version of it. This is a piece of advice often written on these boards... It is better to just describe the relationship dynamic you are in and not add the label "poly".
Open relationship is a consept more widely understood, and actually I often use that term myself - even though I am not very open for new partners at the moment. CJ uses that term as well. On the other hand, Mark likes to define our relationship polyamorous, because he himself is definitely not "open".
I am a woman with two male partners: CJ (legal husband) and Mark (no label added).