ppl. a. Obs. (UN-1 8.)
1664. Boyle, Exp. Colours, III. xl. 309. Common and undephlegmated Aqua-fortis.
1758. Elaboratory laid Open, 161. The undephlegmated spirit may be used.
So † Undephlegmed ppl. a. Obs.
1673. Phil. Trans., VIII. 6002. Not when tis undephlegmed, but when highly rectified.