Dictionary.net

• a knot having the shape of the numeral 8; tied in a rope that has been passed through a hole or pulley and that prevents the rope from coming loose

2006 - WordNet 3.0
By Princeton University

• a knot having the shape of the numeral 8; tied in a rope that has been passed through a hole or pulley and that prevents the rope from coming loose

2011 - English Dictionary Database
By DataStellar Co., Ltd