speaking tube

from WordNet (r) 3.0 (2006)
speaking tube
    n 1: a tube for conveying the sound of a voice from one room to
         another
    
from The Collaborative International Dictionary of English v.0.48
Speaking \Speak"ing\, a.
   1. Uttering speech; used for conveying speech; as, man is a
      speaking animal; a speaking tube.
      [1913 Webster]

   2. Seeming to be capable of speech; hence, lifelike; as, a
      speaking likeness.
      [1913 Webster]

   {A speaking acquaintance}, a slight acquaintance with a
      person, or one which merely permits the exchange of
      salutations and remarks on indifferent subjects.

   {Speaking trumpet}, an instrument somewhat resembling a
      trumpet, by which the sound of the human voice may be so
      intensified as to be conveyed to a great distance.

   {Speaking tube}, a tube for conveying speech, especially from
      one room to another at a distance.

   {To be on speaking terms}, to be slightly acquainted.
      [1913 Webster]
    

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