Biangulate is a term used in geometry to describe shapes that have two angles. The spelling of this word can be explained using the International Phonetic Alphabet (IPA) as /baɪˈæŋɡjʊlət/. The first syllable "bi" means "two" and is pronounced as /baɪ/. The second part of the word "angulate" means "angle" and is pronounced as /ˈæŋɡjʊlət/. Therefore, the correct way to spell this word is "biangulate", which is useful for students and professionals in the field of geometry who need to describe shapes with two angles accurately.