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The Collaborative International Dictionary of English v.0.48:

Collodion \Col*lo"di*on\, n. [Gr. ? like glue; ko`lla 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]