aster definition by Webster's New World
- any of a large genus (Aster) of plants of the composite family, with purplish, blue, pink, or white daisylike flowers
- China aster
- a structure shaped like a star, formed during mitosis around the centrosome in the cytoplasm of a cell: not formed in seed plant cells
Origin: Modern Latin ; from Classical Latin ; from Classical Greek astēr, star
Origin: ; from Classical Greek astēr, star
Origin: Classical Latin diminutive suffix
aster definition by American Heritage Dictionary
- Any of various plants of the genus Aster in the composite family, having radiate flower heads with white, pink, or violet rays and a usually yellow disk.
- The China aster.
- Biology A star-shaped structure formed in the cytoplasm of a cell and having raylike fibers that surround the centrosome during mitosis.
Origin: Latin astēr, a type of plant, from Greek, star, type of daisy; see ster-3 in Indo-European roots.
aster - Medical Definition