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单词 obscure rays
释义

Definition of obscure rays in English:

obscure rays

noun
  • Dark or invisible rays; specifically heat-rays of the solar spectrum. Now rare.

Origin

Mid 19th century; earliest use found in Mary Somerville (1780–1872), science writer and mathematics expositor.

Definition of obscure rays in US English:

obscure rays

noun
  • Dark or invisible rays; specifically heat-rays of the solar spectrum. Now rare.

Origin

Mid 19th century; earliest use found in Mary Somerville (1780–1872), science writer and mathematics expositor.

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更新时间:2024/10/19 11:57:18