subtility†; subtilty†, subtlety; sponginess, compressibility.
rarefaction, expansion, dilatation, inflation, subtilization†.
vaporization, evaporation, diffusion, gassification†.
ether &c (gas) 334.
V. rarefy, expand, dilate, subtilize†.
Adj. rare, subtile, thin, fine, tenuous, compressible, flimsy, slight;
light &c 320; cavernous, spongy &c (hollow) 252.
rarefied &c v.; unsubstantial; uncompact†, incompressed†;
rarefiable†.