The Collaborative International Dictionary of English v.0.48:
Sorbent \Sorb"ent\, n. [L. sorbens, p. pr. of sorbere to suck in, to absorb.] An absorbent. [R.] [1913 Webster]WordNet (r) 3.0 (2006):
sorbent n 1: a material that sorbs another substance; i.e. that has the capacity or tendency to take it up by either absorption or adsorption [syn: sorbent, sorbent material]