核 JLPT N1 Kanji 核 — nucleus, core, kernel JLPT N1 10 strokes Secondary (Jōyō) Radical 木 #475 most frequent Readings On'yomiカク Example words 核かく(1) pit (of a fruit); stone (2) core (3) nucleus; nuclear (4) nuclear weaponry 結核けっかくtuberculosis; tubercule