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plural cornopeans
(music, obsolete) A large valved horn or trumpet, similar to the orchestral cornet (cornet-à-piston). quotations
[…] outside the school-gates were drawn up several chaises […] and a cornopean player, hired for the occasion, blowing away "A southerly wind and a cloudy sky," waking all peaceful inhabitants half-way down the High Street.
1857, Thomas Hughes, chapter 7, in Tom Brown's School Days, part I