Aviation Glossary - Carburettor

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Carburettor

Pressure Carburetor: A hydromechanical device employing a closed feed system from the fuel pump to the discharge nozzle. It meters fuel through fixed jets according to the mass airflow through the throttle body and discharges it under a positive pressure. Pressure carburetors are distinctly different from float-type carburetors, as they do not incorporate a vented float chamber or suction pickup from a discharge nozzle located in the venturi tube.
Float-type Carburetor: Consists essentially of a main air passage through which the engine draws its supply of air, a mechanism to control the quantity of fuel discharged in relation to the flow of air, and a means of regulating the quantity of fuel/air mixture delivered to the engine cylinders.

source: FAA Airplane Flying Handbook (FAA-H-8083-3A)

A device in an internal combustion engine where fuel is vaporized and mixed with air prior to ignition.

source: Wikitionary / Wikipedia and Related Sources (Edited)

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