Norwegian Bokmål

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Norwegian Wikipedia has an article on:
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Etymology

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From olje +‎ skifer.

Noun

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oljeskifer m (definite singular oljeskiferen)

  1. (geology) oil shale

Norwegian Nynorsk

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Norwegian Nynorsk Wikipedia has an article on:
Wikipedia nn

Etymology

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From olje +‎ skifer.

Noun

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oljeskifer m (definite singular oljeskiferen)

  1. (geology) oil shale