\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.

{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.