from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Capable of being distilled, especially capably of being distilled without chemical decomposition
from the GNU version of the Collaborative International Dictionary of English
- adj. Capable of being distilled; especially, capable of being distilled without chemical change or decomposition
from The Century Dictionary and Cyclopedia
- Capable of being distilled; fit for distillation.
Sorry, no etymologies found.
Not only that, it it needs to be distillable into understandable language for the uninitiated, because in my experience most Faculty and Administrators can not really appreciate what the possibilities of virtual words are.
This is strange, because on a rereading, the book seems easily distillable.
The light aromatic materials, and the other substances which are steam-distillable, i.e. which are driven off when coffee is concentrated by boiling, are the main determining factors in the individuality of coffees.
One clever but expensive method  of preparing caffein-free coffee consists in heating the beans under pressure, with some substance, such as sodium salicylate, with the resultant formation of a more soluble and more easily steam-distillable compound of caffein.
But in this case, the subject matter is distillable into a handful of concepts, and the exams use questions with only a single correct answer.
On issue after issue - same-sex marriage, gun control, Muslim rights - they fly straight as a bullet to their final conclusion, usually distillable to the width of a bumper sticker.
On the other hand, I would think this might appeal to Althouse: There’s not really any unified, easily distillable argument in Gingrich's ... proposals, no ideology that might be charted on a continuum and labeled accordingly.