pyroclastic
English edit
Etymology edit
From pyro- + clastic, from Ancient Greek πῦρ (pûr, “fire”), and κλαστός (klastós, “broken”).
Pronunciation edit
- Rhymes: -æstɪk
Adjective edit
pyroclastic (not comparable)
- (volcanology) Mostly composed of rock fragments of volcanic origin or comminuted during an eruption.
- 1862, Joseph Beete Jukes, “Igneous Rocks”, in The Student's Manual of Geology[1], 2nd edition, Edinburgh: Adam and Charles Black, page 68:
- 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," ...
- 2022, Lindsey Fitzharris, The Facemaker, page 61:
- Within sixty seconds, the entire area was razed by pyroclastic material with a temperature of nearly two thousand degrees Fahrenheit.
Derived terms edit
Translations edit
composed of volcanic rock fragments
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Noun edit
pyroclastic (plural pyroclastics)
- A rock mostly composed of rock fragments of volcanic origin.
- 1897, “General Notes: Geology and Paleontology”, in Edward D. Cope, Frederick C. Kenyon, editors, The American Naturalist: An Illustrated Magazine of Natural History[2], volume 31, Philadelphia: The Edwards & Docker Co., No. 363, page 221:
- The basic volcanics are altered andesites, porphyritic diabases and andesites, and various pyroclastics.