dicyclic
/ˌdʌɪˈsʌɪklɪk/ /ˌdʌɪˈsɪklɪk/adjective
1 Zoology. Of the base of a crinoid's stem: consisting of two rings of plates. Of a crinoid: characterized by such a base.
2 Chemistry = bicyclic.
Origin
Late 19th century. From di- + cyclic. Compare bicyclic.