/ ˌbɒmbəˈdɪə(r); NAmE ˌbɑːmbərˈdɪr/ noun
1.
the person on a military plane in the US air force who is responsible for aiming and dropping bombs
2.
a member of a low rank in the Royal Artillery (= a part of the British army that uses large guns)
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WORD ORIGIN
mid 16th cent. (denoting a soldier in charge of a bombard , an early form of cannon): from French , from Old French bombarde cannon, probably based on Latin bombus booming, humming, from Greek bombos , of imitative origin.