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of or relating to the upper portion of the earth’s atmosphere and to interplanetary space, where sound cannot be transmitted because molecules are too far apart to serve as a transmitting medium.
unable to support the propagation of sound; soundless


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  • Anacreon

    c570–c480 b.c, Greek writer, especially of love poems and drinking songs. Historical Examples A glance at the Anacreon will show the truth of this observation. Thomas Moore Stephen Gwynn There were ears for these sounds in Greece long ago, as Anacreon’s ode will show. Excursions and Poems Henry David Thoreau His imitations of Anacreon, and […]

  • Anacreontic

    (sometimes lowercase) of or in the manner of Anacreon. (sometimes lowercase) convivial and amatory. (lowercase) an Anacreontic poem. Historical Examples There is too much of merely Anacreontic prettiness about the description of the bridal bed and the lamenting Loves. Studies of the Greek Poets (Vol II of 2) John Addington Symonds He said this to […]

  • Anacrogynous

    having the female sex organs arising from any cell below the apex of the stem, thereby not terminating its growth, as certain liverworts.

  • Anacrotic

    anacrotic anacrotic an·a·crot·ic (ān’ə-krŏt’ĭk) adj. Of, relating to, or characteristic of the upstroke or ascending limb of an arterial pulse tracing.

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