The Collaborative International Dictionary of English v.0.48:

Tube \Tube\, v. t. [imp. & p. p. Tubed; p. pr. & vb. n.
   Tubing.]
   To furnish with a tube; as, to tube a well.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Tubing \Tub"ing\, n.
   1. The act of making tubes.
      [1913 Webster]

   2. A series of tubes; tubes, collectively; a length or piece
      of a tube; material for tubes; as, leather tubing.
      [1913 Webster]

WordNet (r) 3.0 (2006):

tubing
    n 1: conduit consisting of a long hollow object (usually
         cylindrical) used to hold and conduct objects or liquids or
         gases [syn: tube, tubing]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "tubing":
   adjutage, catheter, drainpipe, efflux tube, fire hose, flue pipe,
   funnel, garden hose, gas pipe, hose, hosepipe, nipple, organ pipe,
   pipe, pipeline, pipette, piping, reed, reed pipe, siamese,
   siamese connection, siphon, snorkel, soil pipe, standpipe,
   steam pipe, stem, straw, tap, tube, tubulation, tubule, tubulet,
   tubulure, waste pipe, water pipe