circumcoronene

Etymology
. From the coronene molecule's ring of fused benzene rings being completely enclosed around its circumference by another outer ring of fused benzene rings.

Noun

 * 1)  An aromatic hexagonal flat sheet molecule composed of fused benzene rings, 3 benzene rings to a side, 19 rings to a sheet. An outer ring of 12 fused benzene rings surrounds the core coronene. Circumcoronene has the molecular formula C54H18

Coordinate terms

 * a large flat sheet composed of fused benzene rings
 * the constituent hexagonal rings of 6 carbon atoms; 1 ring flat sheet molecule
 * the hexagonal flat sheet molecule of 2 benzene rings to a side, 7 rings to a sheet
 * / the molecule that results if every other outer fused benzene ring were removed from circumcoronene, leaving 6 outer rings instead of 12