The word "Ostoid" is spelled with five letters, starting with the letter "O" and ending with the letter "D". The correct pronunciation of "Ostoid" is /ˈɑːstoʊɪd/, as represented by the IPA phonetic transcription. The "O" sound is pronounced as a long vowel sound, followed by "S", "T", "O", and "I". In order to pronounce the last letter "D", the tongue needs to touch the top of the mouth. Overall, "Ostoid" is a unique word with a distinctive sound.