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The Collaborative International Dictionary
Atramentarious

Atramentarious \At`ra*men*ta"ri*ous\, a. [Cf. F. atramentaire. See Atramentaceous.] Like ink; suitable for making ink. Sulphate of iron (copperas, green vitriol) is called atramentarious, as being used in making ink.

Wiktionary
atramentarious

a. (context obsolete English) Like ink; suitable for making ink.