Saltcat
Webster's Revised Unabridged Dictionary
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Saltcat
A mixture of salt, coarse meal, lime, etc., attractive to pigeons.
Century Dictionary and Cyclopedia
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(n)
saltcat
A lump of salt made at a salt-works (see cat, n., 15); also, a mixture of gravel, loam, rubbish of old walls, cuminseed, salt, and stale urine, given as a digestive to pigeons.