nilometer


From The Collaborative International Dictionary of English v.0.48:

Nilometer \Ni*lom"e*ter\, n. [Gr. ?; Nei^los the Nile + ?
   measure: cf. F. nilom[`e]tre.]
   An instrument for measuring the rise of water in the Nile
   during its periodical flood.
   [1913 Webster]
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