In the strict sense of the word.
Full suspensions are a little different, and depending on the suspension layout won't have parts that are relative to this. For instance, Santa Cruz rear triangles, despite having struts that could be loosely aproximated as chainstays and seat stays, are in fact all one piece that would be described as a "rear triangle" or "rear swingarm" in the same way we describe an Orange's rear swingarm.
That being said, we use language to best describe the approximate part. You wouldn't say you cracked the "upper right strut of the rear swingarm"...you'd say you cracked your "right seat stay", because descriptively it makes sense even if there's no basis for it to be called that.
But, that's why I was making the semantic point of calling it a top-tube stay.
You know, now that I've had to explain the joke, it's killed it...and it really wasn't that good to begin with.