• (n.) Gun cotton; -- so called because regarded as containing three nitro groups.
A constituent of soluble guncotton; used in the preparation of collodion and of pyroxylin. ... (05 Mar 2000) ... 
Type: Term Pronunciation: trī′nī-trō-sel′yū-lōs Definitions: 1. A constituent of soluble guncotton; used in the preparation of collodion and of pyroxylin.