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adiaphanous

adiaphanous, a.
  (ædɪˈæfənəs)
  [f. Gr.priv. + diaphanous.]
  Not translucent, opaque.

1658 T. C. in S. Austin Naps upon Parnassus sig. B 3, Upon the Gurmundizing Quagmires and most Adiaphanous Bogs, of the Author's obnubilated Roundelayes. 1826 Kirby & Spence Introd. Entomol. IV. xlvi. 285 Adiaphanous..which does not transmit the light at all. 1833 J. Waterworth tr. Véron's Rule Cath. Faith 77 Nor will our adversaries ever be able to prove..that actions, which are prescribed by human laws, continue..indifferent or adiaphanous. 1855 J. Scoffern in Orr's Circle Sci. IV. 103 We have transcalent and non-transcalent substances..corresponding with the expressions diaphanous and adiaphanous.

Oxford English Dictionary

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