noun (used with a singular or plural verb)
matter ejected, as from a volcano in eruption.

1885–90; neuter plural of Latin ējectus. See eject

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World English Dictionary
ejecta (ɪˈdʒɛktə)
pl n
matter thrown out of a crater by an erupting volcano or during a meteorite impact
[C19: Latin, literally: (things) ejected; see eject]

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American Heritage
Medical Dictionary

ejecta e·jec·ta (ĭ-jěk'tə)
Something that has been ejected from the body. Also called ejection.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
ejecta   (ĭ-jěk'tə)  Pronunciation Key 
Ejected matter, especially from an erupting volcano. Volcanic ejecta usually includes volcanic glass, ash, and rock fragments.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
They have punched through the ejecta blanket and so must have appeared after
  the formation of the large crater.
The size of the proto-solar system and its distance from the explosion
  determine how much of that radioactive ejecta mingles in.
Um, by way of less harmful and even beneficial organic ejecta during the late
  heavy bombardment, for example.
At bottom is the area covered by ejecta, or material blasted into the air.
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