Ancient Greek word root · Earth & Sky

astr-: star

astr- is an Ancient Greek root meaning “star”. Learn its variants and explore 4 connected words.

Meaning and variants

Meaning: star

Root forms: astr-, astro-, aster-

Source word: ἀστήρ — a celestial body (star, planet or other visible celestial object)

Word family and examples

• astronomy

  the scientific study of celestial objects and the universe

• astronaut

  a person trained to travel in a spacecraft

• asteroid

  A naturally occurring solid object, which is smaller than a planet and a dwarf planet, larger than a meteoroid and not a comet, that orbits a star and often has an irregular shape.

• astrology

  Divination about human affairs or natural phenomena from the relative positions of celestial bodies.

Root connections help with vocabulary recall. They are not a complete etymological history, and a spelling match alone does not prove a relationship.

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