Nucleus: meaning, definitions and examples

Used mainly in scientific or technical contexts to refer to the central part of an atom, cell, or system.

• The nucleus of an atom contains protons and neutrons.
• The cell nucleus houses genetic material.

Often used to describe the most important or central part of something, sometimes implying the hardest part or essence.

• Trust is at the core of every strong relationship.
• The Earth's core is made up of iron and nickel.

Refers to the middle point or main area where activities occur; commonly used in general contexts.

• They live in the center of the city.
• The conference was held at the convention center.

Used to describe the vital or most important part of something; often has emotional or sentimental connotations.

• She is the heart of the organization.
• The story's heart lies in its characters' journeys.

Generally used in both scientific and non-scientific contexts to refer to the central and most important part of something. Can relate to cells in biology or the core of an idea in discussions.

• The nucleus of a cell controls its activities.
• The nucleus of the company’s strategy is innovation.

Used specifically in physics and chemistry to describe the central part of an atom, which contains protons and neutrons.

• The atomic nucleus is surrounded by electrons.
• Research on the atomic nucleus has led to many scientific discoveries.

Often used in the context of nuclear physics and engineering, particularly when discussing nuclear reactors or the central part of a star.

• Engineers must ensure the safety of the nuclear core in a reactor.
• The nuclear core of the sun facilitates fusion reactions.

This word has already been tagged above with the same definition.

A specialized term in astronomy, referring to the solid, central part of a comet, made of rock, dust, and frozen gases.

• The cometary nucleus revealed new information about the early solar system.
• Scientists are studying the cometary nucleus to learn more about comet structures.

Primarily used in astronomy to describe the central part of a comet surrounded by a coma of gas and dust.

• The researchers focused their study on the comet core to understand its composition.
• When observed closely, the comet core appeared bright and distinct.