Dr. Bailly gave a quick "ba-dum-dum" to explain "bacchius" which means a metrical foot of three syllables, the first short, the other two long.
Dev Jaiswal, speller 132, looked nervous at the microphone, but he spelled the word correctly.
Dev pumped his fists after he got it right, rushed away, then rushed back to the microphone to say thank you to Dr. Bailly.