Suetiest is a word that is not commonly used, but it refers to something that has the most amount of suet. Suet is the hard fat found around the kidneys and loins of animals, particularly sheep and cows, and is used in cooking to add flavor and richness. The phonetic transcription of suetiest would be /ˈsuːti.ɪst/, with the stress on the first syllable. The "ie" in suetiest is pronounced as "ee", and "est" is pronounced as "ist."