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Cos (f.)[1] est instrumentum, lapis sui generis, quo ferramenta acuuntur vel laevigantur. Multis e lapidibus producitur, quibus quarzi grana minora insunt. Interdum aqua vel oleo cos irriganda est, ne ferri particulis obsita vim acuendi perdat[2]. Cotibus antiquis et gemmae poliebantur[3]
Dicit Horatius:
et in Arte poëtica (304):
...fungar vice cotis, acutum
reddere quae ferrum valet, exsors ipsa secandi;
munus et officium, nil scribens ipse, docebo.
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