Ul″tra‐ism (ŭl″trȧ‐ĭz'm), n. [Cf. F. ultraïsme. See Ultra-.] The principles of those who advocate extreme measures, as radical reform, and the like. Dr. H. More.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.