HSK C4/W2
Correct

研

/ yán / 
Strokes

Definition

to grind/study/research

Example

As a Verb
grind; pestle
1
Yán
研
chéng
成
xìmò
细末

grind (up) sth into fine powder; pulverize by grinding

2
Yányào
研药

grind medicine

As a Verb
study; research