absorber

noun5

1. •
   Something that absorbs.

   • Which can be ignited the more easily with a burning-glass, black or white paper? Black paper, since it is a much better absorber of heat. — 1869
2. •
   A device which causes gas or vapor to be absorbed by a liquid.
3. •
   A material that absorbs neutrons in a reactor.
4. •
   A person who absorbs.

   • Old Lady Dacier’s bluntness in speaking of her grandson would have shocked Lady Wathin as much as it astonished, had she been less of an ardent absorber of aristocratic manners. — 1885
5. •
   A set that, under suitable transformations, can contain any set from a given class within a topological space.

   • By proposition 6.5.4, X is a skeletoid and hence an absorber by theorem 6.5.1. — 1988