as·ter | \ˈas-tər \

Definition of aster 

(Entry 1 of 2)

1 [ New Latin, from Latin, aster, from Greek aster-, astēr star, aster — more at star ]

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 : china aster

2 [ New Latin, from Greek aster-, astēr ] : a system of microtubules arranged radially about a centriole at either end of the mitotic or meiotic spindle


noun suffix

Definition of -aster (Entry 2 of 2)

: one that is inferior or not genuine criticaster

Illustration of aster

Illustration of aster


aster 1a

In the meaning defined above

Examples of aster in a Sentence

Recent Examples on the Web: Noun

In the flower garden, direct-seed sunflowers, cosmos, salvia, zinnias, marigolds, celosia and asters. Debbie Arrington, sacbee, "Want summer veggies? Get to work | The Sacramento Bee," 5 May 2018 These include asters, ornamental salvias, caryopteris, perovskia, lespedeza, buddleia and chrysanthemums. Adrian Higgins, sacbee, "Spend time with mushroom experts – they’ll grow on you," 8 June 2018 For existing broadleaf weeds such as clover, dandelions, dichondra, poison ivy, roadside asters and others, use a broadleaf weed killer containing 2,4-D. Apply it according to label directions for best results. Neil Sperry, star-telegram, "If your yard is in the weeds, here are some tips to control them | Fort Worth Star-Telegram," 17 May 2018 What follows here is Huegel riffing on plant romance, manipulative orchids, promiscuous asters, Florida’s lazy bees and what vegetarians are missing. Kevin Spear,, "Garden sex is passionate, smart, Florida ecologist says," 26 Apr. 2018 As temperatures continue to rise, upper desert slopes and canyons welcome desert dandelion, Mojave aster, indigo bush, and desert paintbrush. Sunset, "Where to See Wildflowers This Season," 22 Jan. 2018 There are flowers that pretty much let anybody come and visit — a lot of asters, for example. Kevin Spear,, "Garden sex is passionate, smart, Florida ecologist says," 26 Apr. 2018 Flowers that can be planted from seed directly into the garden include alyssum, aster, celosia, cosmos, four o’clocks, marigold, morning glory, periwinkle, portulaca, salvia, sunflower, verbena and zinnia. Debbie Arrington, sacbee, "Roses (and rose gardens) fill Sacramento with romance," 13 Apr. 2018 For late fall and into the winter add coneflower, mint marigold, fall aster, calendula, dianthus and alyssum. Calvin Finch, San Antonio Express-News, "Attracting and producing butterflies in your landscape," 6 Apr. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'aster.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of aster


1664, in the meaning defined at sense 1a

History and Etymology for aster

Noun suffix

Middle English, from Latin, suffix denoting partial resemblance

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Time Traveler for aster

The first known use of aster was in 1664

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English Language Learners Definition of aster

: a type of plant that is grown in gardens for its colorful flowers


as·ter | \ˈa-stər \

Kids Definition of aster

: any of various herbs related to the daisies that have leafy stems and white, pink, purple, or yellow flower heads which bloom in the fall


as·ter | \ˈas-tər \

Medical Definition of aster 

: 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, 2010

called also cytaster

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More from Merriam-Webster on aster

See words that rhyme with aster

Spanish Central: Translation of aster

Nglish: Translation of aster for Spanish Speakers

Comments on aster

What made you want to look up aster? Please tell us where you read or heard it (including the quote, if possible).


to reject or criticize sharply

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