subtilization

CIDE DICTIONARY

subtilization, n. [Cf. F. subtilization.].

•  The act of making subtile.  [1913 Webster]
•  The operation of making so volatile as to rise in steam or vapor.  [1913 Webster]
•  Refinement; subtlety; extreme attenuation.  [1913 Webster]

ROGET THESAURUS

subtilization

Rarity

N rarity, tenuity, absence of solidity, subtility, subtilty, subtlety, sponginess, compressibility, rarefaction, expansion, dilatation, inflation, subtilization, vaporization, evaporation, diffusion, gassification, ether, rare, subtile, thin, fine, tenuous, compressible, flimsy, slight, light, cavernous, spongy, rarefied, unsubstantial, uncompact, incompressed, rarefiable.