Capillary water
"Water that remains in the soil after gravitational water is drained out, that is subject to the laws of capillary movement, and that is in the form of a film around the soil grains." (Merriam-Webster, 2019)
Sources
Merriam-Webster. "Capillary water", Entry 1(a). (2019). Link: https://www.merriam-webster.com/dictionary/capillary%20water