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rarefiable

rarefiable, a. Obs. rare.
  In 7 rarifi-, -fy-.
  [f. rarefy v. + -able; cf. F. raréfiable.]
  Capable of being rarefied.

1656 [? J. Sergeant] tr. T. White's Peripat. Inst. 57 Any dense body that is rarifiable. 1680 Boyle Exper. Chem. Princ. ii. 64 That so inconsiderable a proportion of that liquor, should be rarifiable into so much ardent spirit.

Oxford English Dictionary

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