plausive

from WordNet (r) 3.0 (2006)

plausive
    adj 1: expressing or manifesting praise or approval;
           "approbative criticism"; "an affirmative nod" [syn:
           {approving}, {affirmative}, {approbative}, {approbatory},
           {plausive}]

from The Collaborative International Dictionary of English v.0.48

Plausive \Plau"sive\, a. [L. plaudere, plausum, to applaud.]
   1. Applauding; manifesting praise. --Young.
      [1913 Webster]

   2. Plausible, specious. [Obs.] --Shak.
      [1913 Webster]

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