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hydrazoic acid
hydric
hydride
hydrilla
hydriodic acid
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hydroacoustics
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hydrobiology
hy·dro·bi·ol·o·gy [ hdrō bī ólləjee ]


noun 
Definition:
 
study of aquatic plants and animals: the branch of biology that studies water animals and plants

hy·dro·bi·o·log·i·cal [ hdrō bī ə lójjik'l ] adjective
hy·dro·bi·ol·o·gist [ hdrō bī ólləjist ] noun
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