Alric's briefly puzzled--then snaps his fingers, chuckles lightly, and nods.

"Ahh, yes, apologies, you're right... archaically, 'hydrodynamics' referred to the entire field of what's generally called 'fluid mechanics,' now. Plasmas are governed by 'magnetohydrodynamics,' so that's the terminology I've grown accustomed to thinking of. Entirely my mistake."