12) gill 1. The American HeritageŽ Dictionary of the English Language: Fourth Edition. 2000.
...structure of vascular membranes across which dissolved gases are exchanged. 2a. The wattle of a bird. Often used in the plural. b. gills Informal The area around...

13) hurdle. The American HeritageŽ Dictionary of the English Language: Fourth Edition. 2000.
...before graduation. 3. Chiefly British A portable framework made of intertwined branches or wattle and used for temporary fencing. 4. Chiefly British A frame or sledge...