We don't have synonyms for silastic yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are plastic, spastic and elastic.
(n) :
A type of flexible, inert silicone rubber, used especially in prosthetic medicine to make devices such as shunts to control hydrocephalus, artificial heart valves and breast implants.
(n) :
A type of flexible, inert silicone rubber, used especially in prosthetic medicine to make devices such as shunts to control hydrocephalus, artificial heart valves and breast implants.