1

asteroid

noun as·ter·oid \ ˈas-tə-ˌrȯid \
Updated on: 22 Nov 2017

Definition of asteroid

1 : any of the small rocky celestial bodies found especially between the orbits of Mars and Jupiter
2 : starfish

asteroidal

play \ˌas-tə-ˈrȯi-dᵊl\ adjective

Examples of asteroid in a Sentence

  1. Most asteroids are found between Mars and Jupiter.

Recent Examples of asteroid from the Web

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

Origin and Etymology of asteroid

Greek asteroeidēs starlike, from aster-, astēr


2

asteroid

adjective

Definition of asteroid

1 : resembling a star
  • asteroid bodies in sporotrichosis
2 : of or resembling a starfish

Recent Examples of asteroid from the Web

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

First Known Use of asteroid

1824


ASTEROID Defined for English Language Learners

asteroid

noun

Definition of asteroid for English Language Learners

  • : any one of thousands of small planets that circle around the sun


ASTEROID Defined for Kids

asteroid

noun as·ter·oid \ ˈa-stə-ˌrȯid \

Definition of asteroid for Students

: one of thousands of rocky objects that move in orbits mostly between those of Mars and Jupiter and have diameters from a fraction of a mile to nearly 500 miles (800 kilometers)

Medical Dictionary

asteroid

adjective as·ter·oid \ ˈas-tə-ˌrȯid \

medical Definition of asteroid

: resembling a star


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