IPA: /ˌtɛtrəˈɡɒnəli/
KK: /tɛtrəˈgɒnəli/
In a way that relates to a shape with four sides and four angles, like a square or rectangle.
The crystals formed tetragonally, giving them a unique geometric structure.
Tetragonally → It is formed from "tetra-" (from Greek "tetras", meaning four) and "gonon" (from Greek "gonia", meaning angle) combined with the adverbial suffix "-ally" (meaning in a manner). The word "tetragonally" refers to something that is done in a manner relating to four angles, typically describing a four-sided figure or quadrilateral.
Think of 'four' ('tetra-') and 'angles' ('gonon') to remember that 'tetragonally' describes something related to four angles.