monocyclic

adjective

1. having one cycle.
2. Botany. arranged in a single whorl, as the parts of certain flowers.
3. Chemistry. of or relating to a molecular structure containing one ring.

adjective

1. Also: mononuclear (of a chemical compound) containing only one ring of atoms
2. (of sepals, petals, or stamens) arranged in a single whorl
3. (of a plant) having a life cycle that is completed in one year

1. Having a single cycle, as of activity or development.
2. Having a single whorl, as certain flowers and the shells of certain invertebrates.
3. Having a molecular structure with only one ring. Benzene and toluene are monocyclic molecules.