RhymeZone: immelmann definitions

Definitions of Immelmann:

noun: Synonym of Immelman; A surname.
noun: (aviation) Ellipsis of Immelmann turn. [(military, aviation, archaic) A WWI-era fighter pilot maneuver resembling the aerobatic wingover or hammer-head turn, originally developed by Max Immelmann.]

(Definitions from Wiktionary)