tailings

noun

1. the part of a projecting stone or brick tailed or inserted in a wall.
2. tailings,
   1. Building Trades.gravel, aggregate, etc., failing to pass through a given screen.
   2. the residue of any product, as in mining; leavings.

pl n

1. waste left over after certain processes, such as from an ore-crushing plant or in milling grain

noun

1. the part of a beam, rafter, projecting brick or stone, etc, embedded in a wall