Plück″er tube (?). [So named after Julius Plücker, a German physicist.] (Physics) (a) A vacuum tube, used in spectrum analysis, in which the part through which the discharge takes place is a capillary tube, thus producing intense incandescence of the contained gases. (b) Crookes tube.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.