The English Wiktionary has a dictionary definition (meanings of a word) for: substrate

Substrate may mean:

• Substrate (biology), the natural environment in which an organism lives, or the surface or medium on which an organism grows or is attached
• Substrate (marine biology), the earthy material in the bottom of a marine habitat, like dirt, rocks, sand, or gravel
  • Substrate (aquarium), the material used in the bottom of an aquarium
• The stratum that is covered by another geologic stratum
• Substrate (biochemistry), a molecule an enzyme has an effect on
• Substrate (chemistry), the catalytic material upon which chemical species react

Substrate may also mean:

• Wafer (electronics), material upon which integrated circuits are fabricated
• Printed circuit board (electronics), or the electrically insulating portion of a PCB structure
• Substratum, in linguistics, a language that influences but is supplanted by a second language
• Neural substrate, in neuroscience, the set of brain structures that underlies a specific behavior or psychological state
• Substrate (printing), the base material to which images will be printed