tetracyclic

tet ra cy clic |ˌtetrəˈsīklik ˌtɛtrəˈsaɪklɪk | ▶adjective Chemistry (of an organic compound ) having four fused rings of atoms in its molecule. ORIGIN early 20th cent.: from tetra- ‘four ’ + Greek kuklos ‘circle ’ + -ic .

tetracyclic

tetracyclic |ˌtɛtrəˈsʌɪklɪk, -ˈsɪk -| ▶adjective Chemistry (of a compound ) having a molecular structure of four fused hydrocarbon rings.