Words at Play : Top 10 Unusually Long and Interesting Words, Vol. 1
Definition:
sixty-fourth note
About the word:
In this appropriately musical-sounding word, hemi-, demi- and semi-
all mean half. So how does halving something three times get you to a sixty-fourth note? Because you're halving the
quaver, which is an eighth note. Divide that in half, in half again, and in half a third time and you get a
sixty-fourth note.