atrament

noun
at·​ra·​ment | \ˈa‧trəmənt\
plural -s

Definition of atrament 

1 obsolete : ink writing with atrament

2 : a very dark substance usually used of liquids a puff of atrament emitted by the octopus

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History and Etymology for atrament

Middle English, from Latin atramentum, from (assumed) Latin atrare to make black (from Latin atr-, ater black) + Latin -mentum -ment

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