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more general categories information about this item 16. Lexicon and Relations 16. Lexicon and Relations Lexicon and Relations (50) Lexicon (29) description: USDA NAL Agricultural Thesaurus (NALT) is broadly defined and includes terminology organized into 17 subject categories such as biological, physical and social sciences. AFDSI imports food human nutrition ontology. complete name: USDA NALT Food Human Nutrition