D defs.my
Entry 2 senses Webster, 1913

Tubing

/to͞ob'-ĭng/ · Tub·ing · IPA /tˈuːbɪŋ/
01 n. The act of making tubes.
  1. 1.
    The act of making tubes.
  2. 2.
    A series of tubes; tubes, collectively; a length or piece of a tube; material for tubes; as, leather tubing.