dieses

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di·e·sis

D0213300 (dī′ĭ-sĭs)n. pl. di·e·ses (-sēz′) See double dagger.
[Medieval Latin, semitone (which was indicated by a double dagger), from Latin, quarter tone, from Greek, a letting through, from diīenai, to send through : dia-, dia- + hīenai, to send; see yē- in Indo-European roots.]