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Transportation Research Thesaurus

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Each term in the TRT is assigned a unique notational code that conveys its location within the hierarchy. The first letter of the notation represents the facet or top term. Using the notational code it is easy to determine the terms relation in the hierarchy. The term's parent (Ae) will have one less letter (from the right end) as the term (Aea). Siblings (Aeg, Aes) will have the same notational code as the term except the last letter will be different. Children (Aeac, Aeah) will have one letter appended to the end of the notational code of the term.

Hierarchical Display

Top Terms> Safety and security > Pathology > Diseases and medical conditions > Nervous system diseases

Hmd: Diseases and medical conditions
Hmdn: Nervous system diseases
 Hmdne: Epilepsy
 Hmdnn: Narcolepsy

Find documents having Nervous system diseases

Broader Term:
Hmd: Diseases and medical conditions
 
Related Terms:
Hmdb: Cardiovascular diseases
Hmdc: Occupational diseases
Hmdd: Communicable diseases
Hmde: Ear diseases
Hmdf: Cancer
Hmdg: Glandular diseases
Hmdh: Hypoxia
Hmdq: Drug use
Hmds: Alcohol use
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