Illustration of aster
- aster 1a
1
a
: any of various chiefly fall-blooming leafy-stemmed composite herbs (Aster and closely related genera) with often showy heads containing disk flowers or both disk and ray flowers
b
2
: a system of microtubules arranged radially about a centriole at either end of the mitotic or meiotic spindle
: one that is inferior or not genuine
criticaster
Examples of aster in a Sentence
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Clarence Schmidt, San Diego Union-Tribune, 16 Apr. 2025
Cosmos are members of the aster family (Asteracea), whose members produce disk-like flowers packed with tiny blooms and surrounded by showy ray petals.
—Kim Toscano, Southern Living, 15 Apr. 2025
How To Grow And Care For Columbine Flowers Wood Aster
Botanical Name: Eurybia divaricata
Sun Exposure: Partial shade
Soil Type: Average, well-draining
Soil pH: Slightly acidic, neutral (5.5-7.0)
White wood aster is a native wildflower that blooms profusely in the fall in part shade.
—Brandee Gruener, Southern Living, 4 June 2025
The wild blue aster is native to central and eastern United States.
—New York Times Games, New York Times, 15 Feb. 2025
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Noun
To attract butterflies, consider planting milkweed, verbena and aster.
—Clarence Schmidt, San Diego Union-Tribune, 16 Apr. 2025
Cosmos are members of the aster family (Asteracea), whose members produce disk-like flowers packed with tiny blooms and surrounded by showy ray petals.
—Kim Toscano, Southern Living, 15 Apr. 2025
How To Grow And Care For Columbine Flowers Wood Aster
Botanical Name: Eurybia divaricata
Sun Exposure: Partial shade
Soil Type: Average, well-draining
Soil pH: Slightly acidic, neutral (5.5-7.0)
White wood aster is a native wildflower that blooms profusely in the fall in part shade.
—Brandee Gruener, Southern Living, 4 June 2025
The wild blue aster is native to central and eastern United States.
—New York Times Games, New York Times, 15 Feb. 2025
See All Example Sentences for aster
Cite this Entry
“Aster.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/aster. Accessed 19 Jun. 2025.
Copy CitationKids Definition
aster
noun
as·ter
ˈas-tər 
: any of various mostly fall-blooming leafy-stemmed herbs related to the daisies usually with showy white, pink, purple, or yellow flower heads
Medical Definition
aster
noun
as·ter
ˈas-tər
: a system of microtubules arranged in rays around a centriole at either end of the mitotic or meiotic spindle
The first stage in the formation of the mitotic spindle in a typical animal cell is the appearance of microtubules in a "sunburst" arrangement, or aster, around each centrosome during early prophase.—Gerald Karp, Cell and Molecular Biology: Concepts and Experiments, 6th edition
Gerald Karp, Cell and Molecular Biology: Concepts and Experiments, 6th editioncalled also cytaster
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