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