Webster's English Dictionary

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hydrometer

hy.drom.e.ter or hy.dro.met.ri.cal \hi--'dra:m-*t-*r\ \.hi--dr*-'me-trik\ 
   \-tri-k*l\ \hi--'dra:m-*-tre-\ n : a floating instrument for determining 
   specific gravities of liquids and  hence the strength (as of spirituous 
   liquors, saline solutions) - hy.dro.met.ri.c aj