līnĕāris — Lewis & Short
līnĕāris, e (or līnĭāris), adj.id.,
pictura,the art of drawing with lines, without colors, Plin. 35, 3, 5, § 16:
ratio,the science of lines, geometry, Quint. 1, 10, 36:
probatio,a proving by means of lines, a mathematical demonstration, id. 1, 10, 49.—Adv.: līnĕārĭter, by lines, Boëth. Inst. Music. 3, 9 init.