collum

plural colla

1. anatomyA neck, cervix, or neckline part or process.

   1 more example

   No sooner does a little particle of food touch the edge of the delicate collar which surrounds the collum, than it adheres to it and is carried down by currents, that circulate up one side of the collar and down the other, to the end of the collum, in which, along with an accompanying drop of water, it becomes at once engulped^([sic]).

   1882, Frank Coles Phillips, Proceedings of the Bristol Naturalists' Society, volume 3, page 25

2. biologyA collar

plural Collums

1. A surname.