astrophysicist

astrophysics

[as-troh-fiz-iks]
noun (used with a singular verb)
the branch of astronomy that deals with the physical properties of celestial bodies and with the interaction between matter and radiation in the interior of celestial bodies and in interstellar space.

Origin:
1885–90; astro- + physics

astrophysical, adjective
astrophysicist [as-troh-fiz-uh-sist] , noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
astrophysics (ˌæstrəʊˈfɪzɪks)
 
n
(functioning as singular) the branch of physics concerned with the physical and chemical properties, origin, and evolution of the celestial bodies
 
astro'physical
 
adj
 
astro'physicist
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

astrophysicist
1869, usually hyphenated at first, from astro- + physics. Astrophysics is recorded from 1890.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
astrophysics   (ās'trō-fĭz'ĭks)  Pronunciation Key 
The branch of astronomy that deals with the physical and chemical processes that occur in stars, galaxies, and interstellar space. Astrophysics deals with the structure and evolution of stars, the properties of interstellar space and its interactions with systems of stars, and with the structure and dynamics of clusters of stars such as galaxies.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

astrophysics definition


The branch of astronomy devoted to the study of the physical characteristics and composition of objects in the sky. Typical concerns of astrophysics are how much light the stars give off and the size, mass, and temperature of planets and stars.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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