Octagonal a. : Having eight sides and eight angles.

Example:
How do you restore 1939 Octagonal tile?

Taxonomy
Octagonal, Group 1, free encyclopedia, AJC Sires Produce Stakes, Australian Cup, Australian Champion Two Year Old, Australian Champion Three Year Old, Australian Horse of the Year, New Zealand, Australian Derby, Sire, foaled, record time, victories, races, W S Cox Plate, search, adjective.

Defination from the web:
Octagonal (foaled 1992 in New Zealand) is a retired champion Thoroughbred racehorse, affectionately called the big O or 'Occy' ... The two-year-old Octagonal won the AJC Sires Produce Stakes and earned a second placing in the STC Golden Slipper, and AJC Champagne Stakes. ...