Definition of "diesis" []

• See double dagger. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "He found striking analogies between a hit in quarte or tierce with the intervals of music which bear those names: when he made a feint, he cried out, "Take care of this diesis," because anciently they called the diesis a feint: and when he had made the foil fly from my hand, he would add, with a sneer, that this was a pause: in a word, I never in my life saw a more insupportable pedant."
• "A diesis is a quarter tone; hence in a semitone there are included two dieses."
• "La musica è del mio amato Chopin: Fantaisie Impromptu in do diesis minore, o.p."