piping
n. uncountablen. a system of tubes used to carry liquids or gases from one place to another. It can also mean the decorative lines of icing on a cake or the thin fabric tubes on the edges of cushions.
n. a system or network of pipes for conveying fluids or gases; also refers to a narrow tube of fabric or icing used for decorative edging.
The plumber is here to fix the old piping in the basement.
The chef spent hours adding intricate chocolate piping to the wedding cake to match the floral theme.
While the industrial facility required heavy-duty steel piping to transport chemicals, the interior designer chose delicate velvet piping to finish the edges of the custom-made sofas.
Uncountable when referring to the system of pipes or the decorative technique; countable only in rare technical contexts referring to specific lengths of pipe.