Definition of aster in English:

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Pronunciation: /ˈastər/


Image of aster
1A plant of the daisy family that has bright rayed flowers, typically of purple or pink.
  • Genus Aster, family Compositae: numerous species, many of which bloom in autumn, including the wild purple New England aster (A. novae-angliae) . See also China aster.
Example sentences
  • Sow annual flowers such as asters, cosmos, zinnias and marigolds as soon as the frost has passed and the air begins to warm up.
  • There are flowers everywhere in a carpet of colour: orange globemallows and white asters and purple lupins.
  • Roses, pansies, perennial asters, zinnias and even weeds become mildewed.
2 Biology A star-shaped structure formed during division of the nucleus of an animal cell.
Example sentences
  • Such abnormalities can be due to abnormalities in the number of asters and spindle structures at earlier stages of meiosis.
  • Before mitosis, the centrosome becomes duplicated and the daughter centrosomes move to opposite sides of the nucleus and form asters.
  • Meiosis is completed shortly after ovulation, concomitant with the formation of an extensive sperm aster nucleated by the sperm-derived centrosome.


Early 17th century (in the Greek sense): via Latin from Greek astēr 'star'.

Words that rhyme with aster

Antofagasta, Astor, canasta, Jocasta, oleaster, pasta, piastre (US piaster), pilaster, poetaster, Rasta, Zoroaster

For editors and proofreaders

Syllabification: as·ter

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