tɛˈtræɡənəl

Definitions

1. adjective

Having four equal sides or four equal angles; in geometry, a crystal system with four axes of symmetry of equal length at right angles to each other.

“The crystallographer studied the tetragonal structure of the mineral.”

2. noun

A crystal system with four axes of symmetry of equal length at right angles to each other.

“The tetragonal crystal system is commonly found in minerals.”