The tiny silicon wires stick up from the base,or substrate, looking something like a microscopic hair brush.

VOA: standard.2010.02.19

The paper thus acted as the dielectric between the components of each transistor, as well as being the substrate for the circuit, in the same way that the base of a silicon chip acts both as substrate and as dielectric.

ECONOMIST: A new use for a common material

Univac introduced a metal substrate tape and tape recorder for computer digital recording in 1951.

FORBES: Magnetic Tape Turns 60

Transistors and other circuitry can then be printed on to a flexible plastic substrate.

ECONOMIST: REPORTS