pipe opal
pipe opal · pipe opals
Opal formed in an unusual tubular shape, mainly in sandstoneOpal formed in an unusual tubular shape, mainly in sandstone.
Meaning
1 senses(countable, uncountable)Opal formed in an unusual tubular shape, mainly in sandstone.
Forms
plural: pipe opals| Singular | pipe opal |
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| Plural | pipe opals |
regular
Lessons for this word
1 lessons- A1Countable and uncountable nouns — Because it can be uncountable