| villus | Origin: L, shaggy hair, a tuft of hair. 1. <anatomy> One of the minute papillary processes on certain vascular membranes; a villosity; as, villi cover the lining of the small intestines of many animals and serve to increase the absorbing surface. 2. <botany> Fine hairs on plants, resembling the pile of velvet. Source: Websters Dictionary (01 Mar 1998) |
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| villusectomy | Synonym: synovectomy. Origin: villus + G. Ektome, excision (05 Mar 2000) |
| anchoring villus | A chorionic villus that is attached to the decidua basalis. (05 Mar 2000) |
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| chorionic villus biopsy | Transcervical or transabdominal sampling of the chorionic villi for genetic analysis. (05 Mar 2000) |
| chorionic villus sampling | <procedure> A procedure for obtaining a sample of chorionic villi for the purpose of genetic testing, usually performed between 9 and 12th weeks of pregnancy. Amniocentesis testing has greatly supplanted the use of this form of genetic testing. (27 Sep 1997) |
| primary villus | The first stage of chorionic villus development, with columns of cytotrophoblastic cells covered by syncytiotrophoblast. (05 Mar 2000) |
| secondary villus | An intermediate stage of chorionic villus development following invasion by a connective tissue core. (05 Mar 2000) |
| tertiary villus | The definitive chorionic villus with a vascular core separated from maternal blood by connective tissue, cytotrophoblast, and syncytiotrophoblast. (05 Mar 2000) |
| floating villus | A chorionic villus that is not attached to the decidua basalis, but is "free" in the maternal blood of the intervillous spaces. Synonym: floating villus. (05 Mar 2000) |
| free villus | A chorionic villus that is not attached to the decidua basalis, but is "free" in the maternal blood of the intervillous spaces. Synonym: floating villus. (05 Mar 2000) |