episome: DNA that is not incorporated into the genome but is replicated together with the genome (especially in bacterial cells)
deoxyribonucleic acid: (biochemistry) a long linear polymer found in the nucleus of a cell and formed from nucleotides and shaped like a double helix; associated with the transmission of genetic information
tetanus immunoglobulin: sterile solution of globulins derived from the blood plasma of a person who has been immunized for tetanus; provides short-term immunization against tetanus in cases of possible exposure to the tetanus bacillus