ETYMOLOGY
compound of dumble (similar to bumble) + dor (a buzzing flying insect)
EXAMPLE
“…I thank you for your poetry. What is the burnie-bee? Is it not the humble-bee, or what we call the ‘dumbledore‘ – a word whose descriptive droning deserves a place in song?…”
From: A Memoir of the Life and Writing of William Taylor
By John Warden Robberds, Sir Robert Southey, 1799
Lexicophilia 