instillation
medical route of administration where a fluid is applied drop by drop to the eyes, ears, or nose, or locally in a body cavities or space
en-GB/ɪnstɪˈleɪʃən/
en-US/ˌɪnstəˈleɪʃən/
medical route of administration where a fluid is applied drop by drop to the eyes, ears, or nose, or locally in a body cavities or space