ˈa.trəmənt noun
( -s )
Etymology: Middle English, from Latin atramentum, from (assumed) Latin atrare to make black (from Latin atr-, ater black) + Latin -mentum -ment — more at atrocious
1. obsolete : ink
writing with atrament
2. : a very dark substance — usually used of liquids
a puff of atrament emitted by the octopus