| velamentous | Expanded in the form of a sheet or veil. Synonym: veliform. (05 Mar 2000) |
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| velamentous insertion | A form of insertion of the foetal blood vessels into the placenta, in which the vessels separate before reaching the placenta and develop toward it in a fold of amnion, somewhat like the ribs of an open parasol. Synonym: parasol insertion. (05 Mar 2000) |