1) Molding 2) Moulding 3) Necking 1) Necking 
• (n.) In some columns, that part of the capital between the termination of the shaft and the annulet of the echinus, or the space between two neck moldings; -- called also neck of the capital, and hypotrachelium. See Illust. of Column.
Gor`ge·rin' noun [ French, from gorge neck.] (Architecture) In some columns, that part of the capital between the termination of the shaft and the annulet of the echinus, or the space between two neck moldings; -- called also neck of the capital , and hypotrachelium ....
In architecture a gorgerin is a term used to describe in some columns, that part of the capital between the termination of the shaft and the annulet of the echinus, or the space between two neck mouldings.
[n] - the molding at the top of a column
necking noun the molding at the top of a column