Webster
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Webster’s Revised Unabridged Dictionary · 1913

Comparator

Com′pa·ra′tor, n. [L., a comparer.] (Physics) An instrument or machine for comparing anything to be measured with a standard measure; — applied especially to a machine for comparing standards of length.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article.