核 （カク） stone (of a fruit), pit, pip, core (of an organization, team, etc.), nucleus, heart, nuclear weapons, nucleus (of an atom), nucleus (of a cell), condensation nucleus, (planetary) core, ring (in a cyclic compound), kernel, core, nucleus (of a cultured pearl)
核家族 （カクカゾク） nuclear family
中核 （チュウカク） kernel, core, nucleus, center, centre
放射性同位核 （ホウシャセイドウイカク） radioisotope
Kanji
Jōyō kanji, Taught in junior high
JLPT level: N1
475 of 2500 most used kanji in newspapers
Stroke count: 10
Meaning: nucleus, core, kernel
Kunyomi:
Onyomi: カク
Composition: 木 亥
核
Radical
Radical: 木
Meaning: tree
木
Examples
Onyomi Examples
核 （カク） stone (of a fruit), pit, pip, core (of an organization, team, etc.), nucleus, heart, nuclear weapons, nucleus (of an atom), nucleus (of a cell), condensation nucleus, (planetary) core, ring (in a cyclic compound), kernel, core, nucleus (of a cultured pearl)