heptagonal

About 0.01 uses per million words.

Meaning

1. adjective Having seven angles and sides.
2. adjective Belonging to the sequence generated by the formula 5n2−3n2.

Similar words

septagonal undecagonal septilateral heptadecagonal heptangular heptahedral nonagonal sexangular hendecagonal octangular

Often followed by

in apse and rings tower temples