macrocyclic

[ mak-roh-sahy-klik, -sik-lik ]
/ ˌmæk roʊˈsaɪ klɪk, -ˈsɪk lɪk /

adjective Chemistry.

having a ring structure consisting of more than 12 atoms.

Origin of macrocyclic

First recorded in 1945–50; macro- + cyclic