| (Arch.) | One of the chief pieces of framing of a building; a timber laid horizontally on or near the ground to support the uprights; a ground sill or groundsel. |
| (Railroads) | A bed plate for sleepers or ties; a mudsill. |
| (Teleg.) | A metallic plate buried in the earth to conduct the electric current thereto. Connection to the pipes of a gas or water main is usual in cities. |
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