Dear goodness. I'm something of a word nut, and I've never heard this term. It sounds a great deal more like a medical term (e.g., "allopathic") than a linguistics one. My cousin is a speech therapist. I'll ask her if she's heard it.
I don't know that this would be a common question, but a linguist would probably find it interesting. It's sort of an arcane bit of knowledge. I'm sure Professor Henry Higgins would be fascinated. There's a reason for having these sorts of words, but this is such a specialized subject, there aren't too many people who would even look up the definition, because they didn't know this word exists! Still, always nice to add to my knowledge base.