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The horns of a dilemma. (or Syllogismum cornuʹtum); at my witsʹ and; a puzzling question. Dulcarʹnein is the Arabic dhuʹlkarnein (double-horned, having two horns). Hence the 47th proposition of the First Book of Euclid is called the Dulcarnon, as the 5th is the pons asinorum. Alexander the Great is called Iscander Dulcarnein, and the Macedonian æra the æra of Dulcarnein. Chaucer uses the word in Troylus and Cryseyde, book iii. 126, 127.

⁂ The horns of the 47th proposition are the two squares which contain the right angle.

To be in Dulcarnon. To be in a quandary, or on the horns of a dilemma.

To send one to Dulcarnon. To daze with puzzles.

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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.

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Duke Coombe
Duke Ernest
Duke Humphrey
Duke Street (Strand)
Duke and Duchess
Duke of Exeter’s Daughter (The)
Duke or Darling
Duke’s Walk
Dulce Domum
Dulce est Desipere in Loco
Dulce et Decorum est pro Patria Mori (Latin)
Dulcimer (Italian dolcimello)
Dull as a Fro
Dull as Ditch-water