Tetragynian is a word that is not often used in everyday language but is significant in botanical classification. It is spelled as /te.trə.ˈdʒɪ.ni.ən/ using the International Phonetic Alphabet. The "t" and "r" are pronounced separately, followed by a schwa sound before "dʒ" for the "j" sound. The word then ends with the "nian" suffix, which means "of or relating to," making this term refer to a plant that has four pistils or female reproductive organs in its flowers.
In bot., having four carpels or four styles; of the class.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.