Usually, though, lab-grown meat is actually meat. It's possible that it'd have to be labeled "synthetic" or "lab-grown" (similar to how synthetic diamonds are named), but claiming that meat is not meat is nonsensical.
A typical simple one is "animal flesh". Cells grown in a vat aren't flesh, they are a tissue culture.
Note that I'm not particularly animated by the issue, I just don't agree that it is as simple as "claiming that meat is not meat".
It seems to me that this isn't a necessarily property of meat but a contingent one caused by the fact that meat used to only be possible to produce from animal flesh.
You'd be surprised. We even have different names and preferences for different age stages of the animal, different varieties of the animal (regional etc), etc.