Meaning of “hamburger” - Learner’s Dictionary

hamburger

noun uk us /ˈhæmˌbɜːɡər/
IN BREAD [ C ]

a round, flat shape of meat that is cooked in hot oil and eaten between round pieces of bread:

a hamburger and fries
MEAT [ U ] US (UK mince)

beef (= meat from a cow) that is cut into very small pieces

(Definition of “hamburger” from the Cambridge Learner’s Dictionary © Cambridge University Press)