lineament [ˈlɪniəmənt] n.
1.) A line; also, a delineation, diagram, outline, sketch; pl. outlines, designs. lit. and fig. Obs.
2.) A minute portion, a trace; pl. elements, rudiments. Obs.
3.) A portion of the body, considered with respect to its contour or outline, a distinctive feature. Obs. (In the 17–18th c. very frequently applied to the parts of insects.)
4.) fig. in pl. Distinctive features or characteristics. (Now associated with sense 5.)
5.) In narrower sense, a portion of the face viewed with respect to its outline; a feature.
Etymology: Middle English liniament, from Latin lineamentum, from linea, line.
"All literature writes the character of the wise man. Books, monuments, pictures, conversation, are portraits in which he finds the lineaments he is forming" ("History", Ralph Waldo Emerson, 1841).