| DFI | disease-free interval |
|---|---|
| FI | fasciculus intrafascicularis; fever caused by infection; fibrinogen; fixed interval; flame ionizatio... |
| IDI | immunologically detectable insulin; induction-delivery interval; inter-dentale inferius |
| IEI | isoelectric interval |
| IMI | immunologically measurable insulin; impending myocardial infarction; Imperial Mycological Institute ... |