Crookes″ tube′ (kr??ks″ t?b′). (Phys.) A vacuum tube in which the exhaustion is carried to a very high degree, with the production of a distinct class of effects; — so called from W. Crookes who introduced it.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.