Pentagonal (adjective)

Having five angles and five sides.

Origin:

Derived from the greek words 'penta' meaning 'five' and 'gōnia' meaning 'angle'.

Examples:

1. The pentagonal shape of the table made it unique.
2. The pentagonal medal had five points symbolizing the five Olympic rings.
3. A pentagonal room had five walls and five angles.
4. The pentagonal gem was the rarest of the five gems in the collection.
5. A pentagonal star had five points symbolizing the five senses.