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diaschisma

noun
di·a·schis·ma | \ˌdīəˈskizmə\
plural -s

Definition of diaschisma 

1 : one of several minute intervals in ancient Greek music

2 : a small musical interval (such as that between C and D double flat in pure intonation) that together with the schisma comprises the syntonic comma

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History and Etymology for diaschisma

New Latin, from Greek diaschisma, from diaschizein to sever

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