It's ok. It's clear you are a scientist by profession given how passionate you are about the correct usage of the word.
Actually, I'm an editor and developer of math and science content for educational publishing. But I do have two science degrees and am hoping to someday pursue a third.
You really feel that most people in the USA don't fully understand what science is? Or, is it really most of the people you've met? I know that it's a bit of a joke with how deficient our educational system is, enough to even create a show like "Are You Smarter Than a 5th Grader?" But I would agree that in my experience most people who subscribe to metaphysical beliefs tend to not understand what science really is.
Oh, I don't just feel it, I know it. Approximately 28% of Americans are scientifically literate, so, yeah, most Americans don't fully understand what science is.
From what I've learned, acupuncture seems to be a system that was developed gradually over time driven by empirical evidence rather than derived scientific theories.
There was no empirical evidence in the development of acupuncture. There was observation and misinterpretation of evidence (Basically, 80% of all disease and injury will get better on its own whether or not it's treated -- which means that over centuries acupuncturists would have had an 80% success rate, and that's pretty darn good! One can easily see how people could misinterpret the evidence as effect when there was none), but 'empirical evidence,' like 'science,' is a specific term, and acupuncture is pre-scientific.
Not much different from ayurvedic medicine.
Which is also non-scientific. Though it is now being studied, the evidence is too preliminary to know whether or not it is of any real medicinal value.
There is a medical science to how herbs affect the body (some pharmaceuticals are made from processed herbs),
Actually, most pharmaceuticals are derived from natural products. And you've touched upon another very serious issue in the discussion of "alternative medicine," and that is the fact that so many people do not realize that herbs are drugs. If it has a pharmacological effect, it's a drug.
but discovering their properties and how best to combine them was mostly through trial and error.
Kinda sorta. Willow bark was almost certainly discovered to be medicinal by trial and error. The modern usage and dosage of aspirin was determined through the scientific method, which, while at the heart of it
is trial and error, is much more sophisticated than just simply chewing on this tree or that to see which best relieves your headache. There is a big difference between taking a tablet filled with ground foxglove from a naturopath and taking a dose of digitalis prescribed by your doctor.
I think with acupuncture, they probably began to find a "pattern" of sorts with patient responses to specific needle locations and then ultimately attributed them to a "meridian" internal energy system.
This is a possibility, though it doesn't qualify as any kind of science. It has two fundamental aspects of science: observation and the development of hypothesis, but that's it.
I don't think you and I have interacted much on the board yet, so I just want to qualify this post by stating that nothing I've written should be taken as offense against you...my mom recently reminded me that sometimes my enthusiasm for an issue will get the best of me, and that can come off as being dismissive, when that's not at all how I feel.