The word "Thraste" is spelled with a silent "h." In IPA phonetic transcription, it is pronounced /θreɪst/. The "th" sound is represented by the symbol /θ/, which can be pronounced by placing the tip of the tongue behind the top front teeth and blowing air out. The "r" sound is pronounced with the back of the tongue slightly lifted, and the "a" sound is pronounced as in "say." The "s" sound is pronounced with a hissing noise made by air flowing through a narrow opening between the tongue and the upper teeth.