GNU Collaborative International Dictionary of English

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1.       
   Collodion , n. [Gr.  like glue; κόλλα glue +  form. Cf. Colloid.] (Chem.) A solution of pyroxylin (soluble gun cotton) in ether containing a varying proportion of alcohol. It is strongly adhesive, and is used by surgeons as a coating for wounds; but its chief application is as a vehicle for the sensitive film in photography.
   1913 Webster
   Collodion process (Photog.), a process in which a film of sensitized collodion is used in preparing the plate for taking a picture. -- Styptic collodion, collodion containing an astringent, as tannin.
   1913 Webster