| inf | infant, infantile; inferior |
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| IOS | infant observation scale; International Organization for Standardization |
| IRDS | idiopathic respiratory distress syndrome; infant respiratory distress syndrome |
| IS | ileal segment; immediate sensitivity; immune serum; immunosuppression; impingement syndrome; incenti... |
| LBWI | low-birth-weight infant |
| lateral nasal prominence | An ectodermally covered mesenchymal swelling separating the embryonic olfactory pit from the developing eye. Synonym: lateral nasal fold, lateral nasal primordium, lateral nasal process. (05 Mar 2000) |
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