
A Nilometer was a structure for measuring the Nile River`s clarity and water level during the annual flood season. Between July and November, the reaches of the Nile running through Egypt would burst their banks and cover the adjacent flood plain. When the waters receded, around September or October, they left behind a rich alluvial deposit of ex....
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http://en.wikipedia.org/wiki/Nilometer

• (n.) An instrument for measuring the rise of water in the Nile during its periodical flood. • (n.) An instrument for measuring the rise of water in the Nile during its periodical flood.
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http://thinkexist.com/dictionary/meaning/nilometer/
Ni·lom'e·ter noun [ Greek ...; ... the Nile + ... measure: confer French
nilomètre .] An instrument for measuring the rise of water in the Nile during its periodical flood.
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http://www.encyclo.co.uk/webster/N/22

Staircase descending into the Nile and marked with levels above low water; used for measuring, and in some cases recording, inundation levels. The most famous are on Elephantine island and on Roda island in Cairo.
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https://www.encyclo.co.uk/local/10138

Place, generally with column, where the height of the Nile could be measured
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https://www.encyclo.co.uk/local/21433
No exact match found.