the.com/absorbency

means The measurable capacity of a material to soak up and hold liquid.

from Built from 'absorb,' which traces to Latin absorbere — ab- ('away') plus sorbere ('to suck in'). The same sorbere root, possibly related to words for sipping or slurping in other old languages, gives English 'absorb' its original sense of swallowing something whole. The noun-forming '-ency' was tacked on later to turn the verb's action into a measurable property, so 'absorbency' is really just 'the state of thoroughly sucking something in,' dressed up for the lab.