derivative - A compound that can be imagined to arise from a partent compound by replacement of one atom with another atom or group of atoms. Used extensively in orgainic chemistry to assist in identifying compounds; дс тдрлими цюлютдажкию дроемжки аиакиохдйис лидр http://www.netaccess.on.ca/~dbc/cic_hamilton/dictionary/d.html;
