Maybe you're right. But the nature of beauty isn't simply a matter of semantics; it's not really simply a linguistic question. It's an ontological one, and an epistemological one.
In fact, one whole branch of philosophy - aesthetics - is concerned with the "what" of beauty. Whilst scientific can undoubtedly shed light on certain "how's" of beauty, as Doubt said, we don't have the tool set yet do empiricise the "what". Even when we do, such investigations will need to be done with an understanding of exactly what one is trying to investigate - and so we're back to philosophy again.
Empirical aesthetics goes right back to people like Theodore Lipps at the turn of the 20th century. Recently, neuroscientists and aesthetic philosophers have joined forces under the methodological banner of neuroaesthetics (see Zeki from the science side, and Onians from the visual philosophy side), but whilst it does use neuroscientific evidence to inform its thinking, neuroaesthetics is still more philosophy than science.