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aræometer
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aræometer
aræometer, areo- (ɛəriːˈɒmɪtə(r)) [mod. f. Gr. ἀραιός thin + µέτρον measure: see -meter. App. through F. aréomètre: whence the prevalent spelling, as if from area, or areo-, of Mars.] An instrument, consisting of a graduated glass tube terminating in a loaded bulb, for measuring the specific gravity...
Oxford English Dictionary
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hydrometer
hydrometer (haɪˈdrɒmɪtə(r)) [mod. f. Gr. ὑδρο- water + -meter. F. hydromètre (first recorded 1768) was app. adopted from English, but has commonly the sense ‘rain-gauge’, the hydrometer being called in F. aréomètre, aræometer.] 1. An instrument for determining the specific gravity of liquids, or som...
Oxford English Dictionary
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rectangulometer
rectanguˈlometer [f. as rectangul-ar + -ometer.] An instrument for testing right angles.1843 Holtzapffel Turning II. 880 When the work and trial bar, (or rectangulometer), are both laid down, the one side of the bar presents a truly perpendicular face.
Oxford English Dictionary
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