pyroclast

P3Y4R1O1C3L1A1S1T1

noun

Solid matter ejected into the air by an active volcano.

OriginEnglish clast ← Latin pyr ← Ancient Greek πῦρ (pûr) →
Scrabble 16
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Meanings

nounpyroclast (countable and uncountable, plural pyroclasts)

plural pyroclasts

  1. countableuncountablegeographySolid matter ejected into the air by an active volcano.

Origin

  1. Proto-Indo-European*péh₂wr̥
  2. Proto-Hellenic*pāwər
  3. Ancient Greekπῦρ (pûr)
  4. Latinpyr
  5. Englishpyro-
  6. Englishclast
  7. Englishpyroclast

From pyro- + clast.

Full word history & related roots →

Translations

Irish pireaclast
  • pireaclastgeology: solid matter ejected into the air by an active volcano
Italian piroclasto
  • piroclastogeology: solid matter ejected into the air by an active volcano
Cite this entry
APA

pyroclast. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/pyroclast

MLA

“pyroclast.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/pyroclast. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “pyroclast,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/pyroclast.

Source: pyroclast on Wiktionary, CC BY-SA 4.0.