Word.ws English Dictionary

boulder opal

boulder opal noun: an opal consisting of concretions and fracture fillings in a dark siliceous ironstone matrix.

Noun

boulder opal (countable and uncountable, plural boulder opals)

  1. An opal consisting of concretions and fracture fillings in a dark siliceous ironstone matrix.

Forms of boulder opal

pluralboulder opals

Questions about boulder opal

What does boulder opal mean?
Boulder opal means an opal consisting of concretions and fracture fillings in a dark siliceous ironstone matrix.
What part of speech is boulder opal?
Boulder opal is a noun.
What is the plural of boulder opal?
The plural of boulder opal is boulder opals.

Words near boulder opal in the dictionary

  1. boulder clay
  2. Boulder County
  3. Boulder Creek
  4. boulder holder
  5. boulder holders
  6. boulder opal
  7. boulder opals
  8. boulderable
  9. bouldered
  10. boulderer
  11. boulderers

Source and license

Adapted from Wiktionary: boulder opal (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Cite this entry: “boulder opal.” Word.ws, https://word.ws/boulder_opal. Based on Wiktionary, CC BY-SA 4.0.