Definition of Occult
Occult: Hidden.
Occult blood is hidden from the eye but is nonetheless present and can be detected by chemical tests. Spina bifida occulta is a hidden defect in the spinal column.
Source: MedTerms™ Medical Dictionaryhttp://www.medterms.com/script/main/art.asp?articlekey=4618
Last Editorial Review: 8/29/2001
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