Octogonal vs Octagonal - What's the difference?

As adjectives the difference between octogonal and octagonal

is that octogonal is obsolete form of lang=en while octagonal is shaped like an octagon, in having eight sides and eight angles.

(en adjective)

(Webster 1913) ----

* (obsolete)

(-)

(geometry) Shaped like an octagon, in having eight sides and eight angles.