aster

play
noun as·ter \ ˈas-tər \

Definition of aster

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
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

Recent Examples of aster from the Web

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.

Illustration of aster

First Known Use of aster

1664


-aster

noun suffix

Definition of -aster

:one that is inferior or not genuine
  • criticaster

Origin and Etymology of -aster

Middle English, from Latin, suffix denoting partial resemblance


ASTER Defined for English Language Learners

aster

play
noun

Definition of aster for English Language Learners

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


ASTER Defined for Kids

aster

play
noun as·ter \ ˈa-stər \

Definition of aster for Students

: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

Medical Dictionary

aster

play
noun 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 edition2010
called also cytaster

Illustration of aster



Seen and Heard

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

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

agreeable, attractive, or delicious

Get Word of the Day daily email!

Test Your Vocabulary

Merriam-Webster's New Words Quiz—Fall 2017 Edition!

  • young-plant-shoots
  • Which of the following is a new sense of the word bunny?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!