instillation

noun

in·​stil·​la·​tion ˌin(t)-stə-ˈlā-shən, -(ˌ)stil-ˈā- 

1

: an act of instilling : introduction by instilling

repeated instillation of penicillin

2

: something that is instilled or designed for instillation

silver instillation for use in the eyes of the newborn