ămĕthystĭnus

a, um, adj.

amethystus

I. Of the color of amethyst: vestes, Mart. 1, 97, 7.—Also absol.: amethystina (sc. vestimenta), * Juv. 7, 136.—
II. Set or adorned with amethyst: trientes, Mart. 10, 49.
Lewis & Short
A Latin Dictionary, 1879
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