cob [cðb] - n.

1. A corncob: corn on the cob.
2. A male swan.
3. A thickset, stocky, short-legged horse.
4. A small lump or mass, as of coal.
5. A mixture of clay and straw used as a building material.

Probably from obsolete cob, round object, head, testicle.

The American HeritageŽ Dictionary of the English Language, Fourth Edition

Cob Comfort - a study of heat transfer through cob walls
Kathy Bevers | Per Kielland-Lund | Arch 591 Fall 2003 | GTF: Sara Goenner