Norwegian Bokmål

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Norwegian Wikipedia has an article on:
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Etymology

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From lyd +‎ mur.

Noun

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lydmur m (definite singular lydmuren, indefinite plural lydmurer, definite plural lydmurene)

  1. the sound barrier

References

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Norwegian Nynorsk

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Norwegian Nynorsk Wikipedia has an article on:
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Alternative forms

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Etymology

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From lyd +‎ mur.

Noun

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lydmur m (definite singular lydmuren, indefinite plural lydmurar, definite plural lydmurane)

  1. the sound barrier

References

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