定直线
Traditional form:
定直線
Pinyin (reading):
dìngzhíxiàn
Definitions:
- directrix of a parabola
Characters:
- 定 - to decide, to fix, to settle; to order; definite, fixed, sure
- 直 - straight, vertical; candid, direct, frank
- 线 - line, thread, wire; clue, trail
Traditional characters: