{ Twad″dell (?), n., Twad″dell's hy‐drom″e‐ter (?) }. [After one Twaddell, its inventor.] A form of hydrometer for liquids heavier than water, graduated with an arbitrary scale such that the readings when multiplied by.005 and added to unity give the specific gravity.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.