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Pyroclastic vs Undefined - What's the difference?

pyroclastic | undefined |

As adjectives the difference between pyroclastic and undefined

is that pyroclastic is (vulcanology) mostly composed of rock fragments of volcanic origin or comminuted during an eruption while undefined is lacking a definition or value.

As a noun pyroclastic

is a rock mostly composed of rock fragments of volcanic origin.

pyroclastic

English

Adjective

(-)
  • (vulcanology) Mostly composed of rock fragments of volcanic origin or comminuted during an eruption.
  • *{{quote-book
    • , year= 1862 , year_published= , author= , by= , title= The Student's Manual of Geology , url= http://books.google.com/books?id=3DUDAAAAQAAJ&pg=PA68 , original= , chapter= Igneous Rocks , isbn= , edition= 2 , publisher= Adam and Charles Black , location= Edinburgh , editor= , volume= , page= 68 , passage= The word "ash" is not a very good one to include all the mechanical accompaniments of a subaerial or subaqueous eruption, since ash seems to be restricted to a fine powder, the residuum of combustion. A word is wanting to express all such accompaniments, no matter what their size or condition may be, when they are accumulated in such mass as to form beds of "rock." We might call them perhaps "pyroclastic materials," ... }}

    Derived terms

    * pyroclastic flow * pyroclastic rock * pyroclastic surge

    Noun

    (en noun)
  • A rock mostly composed of rock fragments of volcanic origin
  • *{{quote-book
    • , year= 1897 , year_published= , author= , by= , title= The American Naturalist: An Illustrated Magazine of Natural History , url= http://books.google.com/books?id=lnIWAAAAYAAJ&pg=PA221 , original= , chapter= General Notes: Geology and Paleontology , section = No. 363 , isbn= , edition= , publisher= The Edwards & Docker Co. , location= Philadelphia , editor= Edward D. Cope and Frederick C. Kenyon , volume= 31 , page= 221 , passage= The basic volcanics are altered andesites, porphyritic diabases and andesites, and various pyroclastics . }}

    undefined

    English

    Adjective

    (wikipedia undefined) (-)
  • Lacking a definition or value.
  • (mathematics, computing) That does not have a meaning and is thus not assigned an interpretation.
    • The result of division by zero is undefined .

    Antonyms

    * defined