水星逆行 shuǐxīngnìxíng Mercury retrograde Origin Definitions Defs Strokes Stroke Words Sentences Sents 水星 shuǐxīng proper nounnoun Mercury Mercury, the closest planet to the sun in our solar system逆行 nìxíng verb retrograde motion (astronomy) the movement of a planet in a direction opposite to that of other bodies within its system