substrates

noun

1. 1

   What an enzyme acts upon.

2. 2

   A surface on which an organism grows, or to which an organism or an item is attached.

   “The rock surface of a rockpool is the substrate for a sessile organism such as a limpet.”

3. 3

   An underlying layer; a substratum.

4. 4

   A language that is replaced in a population by another language and that influences the language imposed on its speakers.

5. 5

   (plating) A metal which is plated with another metal which has different physical properties.

6. 6

   A surface to which a substance adheres.

7. 7

   The substance lining the bottom edge of an enclosure.

   “Stream substrate affects fish longevity.”