from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective That cannot (readily) be
Sorry, no etymologies found.
The crude fiber and other unnamed constituents of the raw beans react analogously to similar compounds in the destructive distillation of wood, giving rise to acetone, various fatty acids, carbon dioxid and other uncondensable gases, and many compounds of unknown identity.
All About Coffee 1909