本初子午线

the first meridian / the prime meridian

root / stem / origin / source / this / the current / original / inherent / originally / classifier for books, periodicals, files etc

at first / (at the) beginning / first / junior / basic

son / child / seed / egg / small thing / 1st earthly branch: 11 p.m.-1 a.m., midnight, 11th solar month (7th December to 5th January), year of the Rat / Viscount, fourth of five orders of nobility 五等爵位[wu3 deng3 jue2 wei4] / ancient Chinese compass point: 0° (north) / subsidiary / subordinate / sub-

(noun suffix)

7th earthly branch: 11 a.m.-1 p.m., noon, 5th solar month (6th June-6th July), year of the Horse / ancient Chinese compass point: 180° (south)

meridian

variant of 線|线[xian4]

thread / string / wire / line / CL:條|条[tiao2],股[gu3],根[gen1] / (after a number) tier (unofficial ranking of a Chinese city)

the Greenwich meridian