1. adjective /əbsˈɔː(r)bənt/

Those paper towels were amazingly absorbent. That was quite a spill.

2. noun /əbsˈɔː(r)bənt/
a) Anything which absorbs.

In the Southern Ocean the winter is not so excessively cold, but the summer is far less hot, for the clouded sky seldom allows the sun to warm the ocean, itself a bad absorbent of heat: and hence the mean temperature of the year is low.

b) Any substance which absorbs and neutralizes acid fluid in the stomach and bowels, as magnesia, chalk, etc.; also a substance, e.g., iodine, which acts on the absorbent vessels so as to reduce enlarged and indurated parts.

Wikipedia foundation.