Dictionary.net

• one of several connecting veins in the scalp and head that drain blood from sinuses in the dura mater to veins outside the skull

2006 - WordNet 3.0
By Princeton University

• one of several connecting veins in the scalp and head that drain blood from sinuses in the dura mater to veins outside the skull

2011 - English Dictionary Database
By DataStellar Co., Ltd