THESAURUS
hairline
band, bar, cross-hatching, dash, delicacy, delicate, delicate distinction, delineation, diagonal, differentia, differential, distinction, dotted line, fine point, finespun, hachure, hairsplitting, hatching, line, lineation, margin, narrow margin, nice, nice distinction, nicety, nuance, particle of difference, point of difference, refined, refinement, score, shade of difference, slash, streak, streaking, striation, strip, stripe, striping, stroke, sublineation, subtle, subtle distinction, subtlety, underline, underlining, underscore, underscoring, virgule, wide margin