heptagonal

[ hep-tag-uh-nl ]

adjective

1. having seven sides or angles.

Word History and Origins

Origin of heptagonal¹

First recorded in 1605–15; heptagon + -al ¹

Example Sentences

It is a little heptagonal recess, paved with white marble and roofed with a shell-like cupola of marble of a single block.

From Project Gutenberg

Meshes regular or subregular, hexagonal, often intermingled with a variable number of pentagonal and heptagonal meshes.

From Project Gutenberg

Meshes subregular pentagonal (intermingled with single tetragonal, hexagonal, and heptagonal meshes).

From Project Gutenberg

Shell-mantle one and a third times as long as broad, its frontal perimeter heptagonal, with seven concave sides.

From Project Gutenberg

The effect of a heptagonal stem on an octagonal base or plinth is certainly odd.

From Project Gutenberg