凹线

Traditional form:

凹線

Pinyin (reading):

āoxiàn

Definitions:

• groove

Characters:

• 凹 - concave, hollow; depressed; pass, valley
• 线 - line, thread, wire; clue, trail

Traditional characters:

• 凹 - concave, hollow; depressed; pass, valley
• 線 - line, thread, wire; clue, trail