Learn how to say Turbofan correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word turbofan:
Also called: high bypass ratio engine. a type of by-pass engine in which a large fan driven by a turbine and housed in a short duct forces air rearwards around the exhaust gases in order to increase the propulsive thrust
an aircraft driven by one or more turbofans
the ducted fan in such an engine
Also called (for senses 1, 2): fanjet