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Webster 1913 Edition

Adj.

[Cf. F.

atramentaire

. See

Like ink; suitable for making ink. Sulphate of iron (copperas, green vitriol) is called atramentarious, as being used in making ink.

atramentarious ‎(comparative more atramentarious, superlative most atramentarious)

(obsolete) Like ink; suitable for making ink.
Sulphate of iron is atramentarious.