(biochemistry)
A single- or double-stranded ring of deoxyribonucleic acid found in certain bacteriophages and in human wart virus. Also known as ring deoxyribonucleic acid.
A deoxyribonucleic acid molecule that has no free 5′ or 3′ ends; characteristic of prokaryotes but also found in mitochondria, chloroplasts, and some viral genomes.