1. Relational database of the United States National Library of Medicine for the storage and retrieval of bibliographical information concerning the biomedical literature
   - MEDLARS

Type of: relational database

• hydrotropism
• hydrous
• hydroxide
• hydroxide ion
• hydroxy
• hydroxy acid
• hydroxyacetic acid
• hydroxybenzene
• hydroxybenzoic acid
• hydroxybutyric acid
• hydroxychloroquine
• hydroxyl
• hydroxyl group
• hydroxyl ion
• hydroxyl radical
• hydroxylamine
• hydroxymethyl
• hydroxyproline
• hydroxytetracycline
• hydroxyzine
• hydroxyzine hydrochloride
• Hydrozoa
• hydrozoan
• Hydrus
• Hyemoschus