01 n. The first book for children, or that from which in former times they learned their letters and rudiments; -- so called because a sheet of h…
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1.
The first book for children, or that from which in former times they learned their letters and rudiments; -- so called because a sheet of horn covered the small, thin board of oak, or the slip of paper, on which the alphabet, digits, and often the Lord's Prayer, were written or printed; a primer.
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2.
A book containing the rudiments of any science or branch of knowledge; a manual; a handbook.