hairline

詳細解釋：

hair.line

n.（名詞）
The outline of the growth of hair on the head, especially across the front.
髮際線：頭部頭髮生長的外型，尤其是前額頭髮的輪廓
A very slender line.
細長的線：一根非常纖細的線
Printing
【印刷術】
A very fine line on a typeface.
鉛字表面的細線
A style of type using such lines.
使用這種細線的鉛字

A textile design having thin, threadlike stripes.
有細直條紋的織物圖案
A fabric, usually a worsted, with such stripes.
有這種條紋的織物，通常是精紡呢