核
Meanings
The hard inner part of a fruit containing the seed.
When I planted a peach pit, it sprouted.
The central or most important part of an organization, group, or abstract entity.
He is the core player of the team.
atomic nucleus
Physics term for the central part of an atom.
See also: 原子核
The atomic nucleus consists of protons and neutrons.
cell nucleus
Biology term for the membrane-bound organelle containing genetic material.
See also: 細胞核
The cell nucleus contains DNA.
condensation nucleus
Meteorology term for a particle on which water vapor condenses.
See also: 凝結核
Condensation nuclei are necessary for cloud formation.
planetary core
Astronomy term for the central region of a planet.
The Earth's core is made of iron and nickel.
ring; cyclic core
Chemistry term for the ring structure in a cyclic compound.
The benzene ring has a hexagonal structure.
Mathematics term, e.g., the kernel of a linear map or the core of a game.
The kernel of a linear map is also called the null space.
pearl nucleus
The bead or piece of mantle tissue inserted into a mollusk to form a cultured pearl.
Freshwater mussel shells are often used as the nucleus for cultured pearls.
Usage patterns
- 〈事〉の核となるto become the core/nucleus of something
He is the core member of the team.
- 核を保有するto possess nuclear weapons
That country is said to possess nuclear weapons.
- 核が分裂するfor a nucleus to undergo fission
The atomic nucleus splits and releases energy.
- 〈物〉の核を取り除くto remove the pit/stone of a fruit
I remove the pit from the peach before eating it.
- 細胞の核を観察するto observe the nucleus of a cell
I observed the cell's nucleus under a microscope.