hydrometer

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a measuring instrument for determining the specific gravity of a liquid or solid
• Syn:
gravimeter
• Derivationally related forms:
gravimetric (for: gravimeter), hydrometric
• Hypernyms:
measuring instrument, measuring system, measuring device
• Hyponyms:
salinometer, thermohydrometer, thermogravimeter