錬

Kanji: 錬
Level: N1
Meaning: tempering, refining, drill
On'yomi: レン
Kun'yomi: ね.る
Strokes: 16
Common compounds: 鍛錬 (たんれん) tempering 錬金術 (れんきんじゅつ) alchemy
Memory hook: Refining metal (金) through repeated practice.