enneagonal

From enneagon +‎ -al.

enneagonal (not comparable)

1. (geometry) In the form of an enneagon; having nine angles.

   enneagonal angle

• “enneagonal”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.

From enneàgon +‎ -al.

enneagonal m or f (masculine and feminine plural enneagonals)

1. nonagonal