mon·o·cyc·lic 
(mŏn′ə-sĭklĭk, -sīklĭk)
(mŏn′ə-sĭklĭk, -sīklĭk)adj.
1. Having a single cycle, as of activity or development.
2. Biology Having a single whorl, as certain flowers and the shells of certain invertebrates.
3. Chemistry Having a molecular structure with only one ring.