The Collaborative International Dictionary of English v.0.48:

Emplastic \Em*plas"tic\, a. [Cf. F. emplastique, fr. Gr. ?
   clogging. See Emplaster.]
   Fit to be applied as a plaster; glutinous; adhesive; as,
   emplastic applications.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Emplastic \Em*plas"tic\, n.
   A medicine causing constipation.
   [1913 Webster]