aster

1 of 2

noun

as·​ter ˈa-stər 

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

: china aster

2

: a system of microtubules arranged radially about a centriole at either end of the mitotic or meiotic spindle

Illustration of aster

• aster 1a

-aster

2 of 2

noun suffix

: one that is inferior or not genuine

criticaster

Examples of aster in a Sentence

Recent Examples on the Web

Noun

Compared to the desolate, almost alien landscape of South Dakota, the North Dakota badlands are flush with vibrant vegetation: Rocky Mountain juniper woodlands, cottonwoods that thrive in the Little Missouri River basin, and sunflowers, asters, and rabbitbrush that bloom in the late summer months. —Erica Zazo, Outside Online, 9 Jan. 2025

Your baby girl will love these colorful roses, daisies, and asters sitting in her bedroom. —Blake Bakkila, Glamour, 10 Jan. 2025

Flowers from the sunflower family (Asteraceae), including asters and coreopsis, offer large quantities of both pollen and nectar and also have very accessible flowers. —Laura Russo, The Conversation, 7 Jan. 2025

Monarchs are particularly attracted to flowers such as asters, coneflowers, zinnias, lantana and black-eyed Susans. —Brandi D. Addison, Austin American-Statesman, 10 Dec. 2024

Word History

Etymology

Noun

(sense 1) borrowed from New Latin, genus name, going back to Latin aster-, astēr "a plant, probably Aster amellus," borrowed from Greek aster-, astḗr "star, the plant Aster amellus"; (sense 2) borrowed from Greek aster-, astḗr "star" — more at star entry 1

Noun suffix

Middle English, from Latin, suffix denoting partial resemblance

First Known Use

Noun

1664, in the meaning defined at sense 1a

Phrases Containing aster

• aster yellows
• China aster

Kids 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

called also cytaster