any of a class of synthetic materials which are polymers with a chemical structure based on chains of alternate silicon and oxygen atoms, with organic groups attached to the silicon atoms. Such compounds are typically resistant to chemical attack and insensitive to temperature changes and are used to make rubber and plastics and in polishes and lubricants

silicone rubber

modern plastics and silicones

join or otherwise treat (something) with a silicone

the raised planting shelf could be siliconed to the back of the tank