Siphon
Definition 1 of 3
Pro Tip 1/3
Gravity Dependent
The noun form of 'siphon' relies on gravity to work, like sucking liquid through a straw. The mechanic needed a siphon to empty the gasoline tank.
Pro Tip 2/3
Flow Direction
'Siphon' implies a liquid moving from a higher area to a lower one without a pump. After the rain, we used a siphon to remove water from the cover.
Pro Tip 3/3
Initiating Process
Starting a siphon may require suction to begin the liquid flow. He started the siphon by sucking on the tube.