UMLS中目前关注的四个表之二[MRDEF]

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2.7.1.3.6 Definitions (File = MRDEF.RRF)
There is exactly one row in this file for each definition in the Metathesaurus. A definition is an attribute of an atom (an occurrence of a string in a source vocabulary). A few approach 3,000 characters in length.

	Col.	Description
	CUI	Unique identifier for concept
	AUI	Unique identifier for atom - variable length field, 8 or 9 characters
	ATUI	Unique identifier for attribute
	SATUI	Source asserted attribute identifier [optional-present if it exists]
	SAB	Abbreviated source name (SAB) of the source of the definition Maximum field length is 20 alphanumeric characters.  Two source abbreviations are assigned:   Root Source Abbreviation (RSAB) — short form, no version information, for example, AI/RHEUM, 1993, has an RSAB of "AIR" Versioned Source Abbreviation (VSAB) — includes version information, for example, AI/RHEUM, 1993, has an VSAB of "AIR93" Official source names, RSABs, and VSABs are included in Appendix B.4.
	DEF	Definition
	SUPPRESS	Suppressible flag. Values = O, E, Y, or N. Reflects the suppressible status of the attribute; not yet in use. See also SUPPRESS in MRCONSO.RRF and MRDEF.RRFand MRREL.RRF.
	CVF	Content View Flag. Bit field used to flag rows included in Content View. This field is a varchar field to maximize the number of bits available for use.

Sample Records

C0001175|A0019180|AT15060425||MSH|An acquired defect of cellular immunity associated with infection by the human immunodeficiency virus (HIV), a CD4-positive T-lymphocyte count under 200 cells/microliter or less than 14% of total lymphocytes, and increased susceptibility to opportunistic infections and malignant neoplasms. Clinical manifestations also include emaciation (wasting) and dementia. These elements reflect criteria for AIDS as defined by the CDC in 1993.|N|| C0001175|A0021048|AT14042185||CSP|one or more indicator diseases, depending on laboratory evidence of HIV infection (CDC); late phase of HIV infection characterized by marked suppression of immune function resulting in opportunistic infections, neoplasms, and other systemic symptoms (NIAID).|N|| C0001175|A0021055|AT18420297||PDQ|Acquired immunodeficiency syndrome. An acquired defect in immune system function caused by human immunodeficiency virus 1 (HIV-1). AIDS is associated with increased susceptibility to certain cancers and to opportunistic infections, which are infections that occur rarely except in individuals with weak immune systems.|N||