Well, what is wrong with that? 
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The important feature of the two ends of the syphon or siphon is that the exit end should be lower down than the source end, so that gravity can pull the liquid through the tube. Atmosphere presses on both ends and it seems to be important to prevent gaps from opening up in the liquid. Also, the OED was under the influence of auto mechanics union I think 
Syphoning is too powerful a tool to be understood by the masses.
Feb 20, 2017
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#4
Excuse the slight delay () but the decrease in atmospheric pressure is about 12 Pascals per meter, which is very feeble compared to the weight of a column of liquid or solid and woefully inadequate to drive a siphon. [It is enough to make a lighter than air balloon rise].
PLEASE get the physics correct ! Try it with a straw. The exit side must be longer and the liquid level lower than the intake side and the atmosphere is all that is needed. Good job JustaDude80.
Jun 9, 2018
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#7
RPaulB wrote:
PLEASE get the physics correct ! Try it with a straw. The exit side must be longer and the liquid level lower than the intake side and the atmosphere is all that is needed. Good job JustaDude80.
Slight problem with this (entirely wrong) claim. The atmospheric pressure at the higher end of a syphon is LOWER than at the lower end. Even if the difference was not tiny, how exactly is the LOWER pressure at the top going to force the liquid down?
In truth it's all about gravity, as the OP said. The only role of atmospheric pressure is to stop the liquid boiling.
For over a century, the Oxford English Dictionary had this incorrect definition of syphon:
"A pipe or tube of glass, metal or other material, bent so that one leg is longer than the other, and used for drawing off liquids by means of atmospheric pressure, which forces the liquid up the shorter leg and over the bend in the pipe."