Pronunciation: ŏ-kŭlt′, ok′ŭlt
1. Hidden; concealed; not manifest.
2. Denoting a concealed hemorrhage, the blood being inapparent or localized to a site where it is not visible.
3. In oncology, a clinically unidentified primary tumor with recognized metastases.
See: occult blood
The definition information for occult is provided by Stedman's. You can search our medical dictionary here.