AHA! So, in fact, the statement that "Fluids include liquids, gases, and plasmas" is false, whereas it should says "fluid MECHANICS include liquids, gases, and plasmas".
And I rather resent you opening with "if it will ease your tortured mind", as though it's a silly issue to raise. Why I hold accuracy to be an important virtue.
Interesting.. I'll read on that!
But another thing on wiki I wonder about
This is because the fluid sticks to the walls, right?