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1 Amount of slope given to any part of a roof.

2 Tenacious black resinous substance, hard when cold, becoming a thick viscid semiliquid when heated: it is obtained as a residue from the boiling or distillation of tar. It is used in its melted form to protect external timbers, e.g. clap-boarding or weather-boarding, and, if mixed with ground chalk, sand, and tar, for surfacing roads, etc.

Subjects: Architecture.

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