n :  a thin skin or film: as  a  :  an outer membrane of some protozoans (as euglenoids or paramecia)  b  :  a bacterial growth in the form of a sheet on the surface of a liquid medium  c  :  a thin layer of salivary glycoproteins coating the surface of the teeth .
 
 
 
Similar sounding terms:  pli·cal  po·lyg·a·la 
 
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